What are the powerful offpage strategies that should be implemented for websites?

I've gone back to the 90's...

Me thinks you don't know the meaning of the words powerful and strategies.

These are terrible linking strategies. And that's how these ideas are often promoted.
But a few have real use.

Forum posts can actually show up in Google search results. Warrior Forum posts are often at the top of a search. But it's because the headline of the thread matches the search phrase.

Articles can show up in Google search results. But article directory articles seldom show up on the first page of a Google search.
But using these as ways to create incoming links, hoping to get a website to show up on Google....it doesn't have any juice at all.

It isn't the number of links, but the relevance of links....and the relevance of the website they are on.

You can go to Fiverr.com and for $5 get thousands of links from the sources in the list...and it makes no difference. And nobody ever clicks on those links.

Do you use some printed products and promotional gifts for your business? It will work great too. I like creating some custom lapel pins using the help of the service from http://www.pinsource.com/ They also have some other promo gifts there, maybe you will like the idea too

Building backlinks to a site is one of the toughest tasks. It should be also done with care else instead of getting your site rank higher, you'll get penalized by search engines. Below I am sharing with you few untapped places to get backlinks without getting penalized by search engines.

Fiverr Forum

Fiverr is one of the best micro digital service selling sites with DA of more than 90 where you can buy & sell digital services flawlessly. If you have already an account with Fiverr then you are allowed to contribute & log into the Fiverr forum.

Hire Bloggers in BlogDash

BlogDash is the best untapped place to get quality & do follow backlinks. This is a community of the bloggers you wanted to meet with. BlogDash gives you a simple way to find other bloggers & list your own blogs.

Giphy

Giphy is the best place to create, upload & share animated images with the whole Giphy community & with your friends. One positive feature with Giphy is that you're free to upload images & include a link-back in the source of the image.

Document Sharing Sites

There are numerous sites such as Dropbox & Secure File Sharing, Storage, and Collaboration | Box etc where you can upload docs files including your backlinks in the document & get backlink from quality sites.

Storify - Create stories using social media

Storify is a site where you can share stories & include a link back to your site. Also, it gives you an opportunity to add a backlink in your author bio.

Eventbrite

Eventbrite is the best place to create an even & get a backlink to your site. There are more high Domain Authority sites as well where you can create events & get backlinks free of cost from each event you create.

Digital Marketing Forums

There are out are countless forums for every type of niches that provide you to become a registered member of their forums, participate in the forum, help their clients & get quality backlinks to your site in a return. Some of the examples of forums are warriorforums Resources and Information., http://Forums.DigitalPoint.com etc.

Contently

Contently - Content Marketing That Works is the best place to share your publications, stories, blog posts & get backlinks. The domain authority is more than 70 so sharing your site to this domain will give you much link-juice.

Listly

Like other bookmarking sites, Lists made social - Listly also comes first here. You can listify everything you want in your account. Either you like to add your blog posts with a link or you want to save your images. The domain authority of Lists made social - Listly is more than 60.

MyVidster

Have you put a video in your site or blog post? If you have then MyVidster - collect the videos you love is the place for you to submit your site or blog post to get a backlink from this high DA & PA site. Create an account with it, go to my account, bookmark & put in your blog or site url & then click on Retrieve Video & you're all set. After your video is retrieved, in the sidebar of the video, you'll find a link to the video source.

YouTube

Create a Youtube Channel. No videos of your own? No problem, you can share other people's videos. Make sure that the videos you put on your channel are relevant to your link. Your link goes in the 'About' page for your channel. Again, make sure there is plenty of relevant content in your about page -- a good 300 words or so. You can also add your link in the description of your videos. You can put links in comments also, so make sure you add some, and again make them relevant.

Facebook

You hopefully already already have a Facebook Fan Page/Business Page. If not, create one at once -- have you been living under a stone for the last 6 years! Put your link on the Page, and also you can add it to any posts or comments you make on your own Page or other people's Pages.

Google+

Although Google+ never took off as the gamechanging social network it was supposed to be, it's still a powerful source of backlinks. Put them in your Profile page, and also in individual posts. Backlinks from Google -- nice!

Pinterest

You can get Backlinks from your profile page, and from Pins that you post. Pinterest is huge at the moment. And like all these sites, you can get a lot of traffic from it, as well as backlinks.

LinkedIn

LinkedIn is HUGE. Not just for a very high-authority backlink, but also for the traffic you can get from within the site. It does require a bit of specialist knowledge to setup your LinkedIn profile properly.

SlideShare

SlideShare is a presentation-sharing platform owned by LinkedIn. Just create a short presentation or two, and put your links inside. They don't need to be long, or complicated -- you could just take some bullet points from a blog post for example, and turn them into a quick PowerPoint presentation.

Reddit

Another site that can send you massive traffic if you do it right. The way to get your link here is to create your own relevant subreddit, and post your links, along with some relevant text in the column on the right. You can also post links in comments on other subreddits, which can send you tons of traffic in a heartbeat, but be very careful. Read, and scrupulously obey, the guidelines and make sure you engage with the community before posting any links.

Vimeo

Now you have the video of your presentation that you made for YouTube, you can also share it here. Put a link in your profile, and also in any video as that you post.

Vube

Another video sharing site where you can put a backlink on your About page.

Flickr

Yet another huge site where you can get backlinks. Just share some photographs, and you can put backlinks in your profile, and in the descriptions too. You could use product photographs, blog post headers, pictures from social media posts, even a picture of you -- it doesn't matter! Flickr also does video too, so post that video that you made for YouTube here as well. It's coming in handy, that little video isn't it? Well worth the couple of hours it took to make it.

Tumblr

Tumblr is a massive high domain authority blogging site. Create a free blog (takes minutes), and you can share as many links as you like. As with all of these things, just a link on its own is no use. Post some interesting stuff, follow other people, comment, share, and engage with the community, and you can build a following quite quickly.

Del.icio.us

Social bookmarking site. Just bookmark your links and build up your profile.

Wikipedia

Huge! It's not easy to get backlinks from Wikipedia, but they are well worth the effort if you can. The best way is to find articles in your niche and find mistakes in them (eg broken links, or outdated references) and fix them with a link to a page of your own that is a better reference. Or you can add new references to your own material. Either way, you need to make sure that what you post is genuinely useful or your edit will soon be removed!

wikiHow

Similar to Wikipedia. You can create your own articles with links inside. Once again, you need to focus on providing useful, high quality information, but as long as you do that there is no problem with providing links to your site as references.

Quora

Huge site where people can ask and answer questions. You can put a link in your profile, and also in your answers to questions. Quora is a great place to meet your audience and find out what problems they are facing. Answer questions and build a presence in the community, and you will quickly become a recognised expert, which will attract traffic to your site. You can put links to your site into your answers too.

WordPress

Have you got a WordPress site? If so you can post a support question on the WordPress support forum and get a high quality backlink to your site. You must have some little issue with your site that you could ask for help with -- if not think of one. And you'll probably get an answer to your question too! Many WordPress themes also have a 'showcase' page in their forums, or a 'request for feedback' page. If the Theme you're using has one of these, you can get another link there. None of these links may not be relevant to your niche, but they can actually send you a bit of traffic -- especially if your site looks nice!

Diigo

Social Bookmarking site where you can bookmark your own pages as well as other people's. Links in your bookmarks and also in your profile. You can also create groups to engage with other people and make your links more relevant.

Disqus

Blog commenting system. Create an account and put a link in your profile page. You can also put links in comments that you leave, subject of course to them being approved by the blog owner. But if they provide useful information, and are a valuable addition to the thread, rather than just blatant self promotion, you should be fine.

Livefyre

Another blog commenting system, like Disquus. Again, you can put a backlink in your profile page, and more links in your comments. If you do it right, you can get backlinks in comments on some of the biggest sites in the world.

TED

A huge and highly engaged global community. Create a profile and fill in all the details, adding links to your site and social media accounts.

Alltop

All the top stories from around the world. Huge source of high-quality backlinks. Submit your site to AllTop, and if accepted you'll get dofollow links from a DR 66 site that's growing all the time.

Criticue

Website review site. Submit your site for review and you'll get a nice dofollow link, and also some feedback on your site as well!

Medium (medium.com)

One of my favourite sites on the internet. People go to Medium specifically to read great content -- there is a hungry crowd there. You can post excerpts from your articles with a link back to your site to read the whole thing, and put a link in your profile too. These links are all dofollow, and Medium has a DR of 87!

About Me (about.me)

Gives you a beautiful personal information page with a dofollow link to your website, and your social media profiles from the 502nd biggest site on the internet with an Ahrefs DR of 75.

You forgot signatures