they are quite effective.. just be sure to use unique quality content min 500 words per article...
links from those sites (when indexed) can easily get a brand new website to top50

Backlinks from such a quality site are very useful for your site.

Well in my opinion Web2.0 sites backlinks are quite effective and useful for your site! You must focus on content quality while posting on these sites!

Links from the web 2.0 are quite powerful PROVIDED they are contextual links coming from within relevant unique quality content. If you copy articles from somewhere else to those sites, you cannot expect a boost in rankings.

So make sure to post only quality content related to the topic of the site you are linking to. You can also include pictures or videos on these blogs, which has been working for me quite well lately.

Pinging may not be enough to index these backlinks, so if you cannot get them indexed, build some backlinks to those backlinks, which helps get them indexed and also strengthens them which in turn strengthens your main money site.

Backlinks are defenetly effective for good seo placement purposes.

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If the blog/website has a good traffic and decent PR then your backlinks will help you. Better check also not to have a huge amount of outbound to that page where you will but your backlinks. Also stay away from Farm-Backlink-Sites.

Backlinks are fundamental to SEO & your site's rankings. Backlinks from free blogs etc like weebly.com, blogspot.com, webs.com, wikidot.com, webnode.com are very effective (these sites have a high PR & Google favors social networking sites), especially if they are dofollow backlinks.

You can derive more value from you web 2.0 back links when you also build links to the your post.

The issue with the web 2.0 sites is that there's some work to be done to get those pages/links indexed. But with the indexed, unique and quality content with the contextual link in it it could move you to a higher positions in SERP.

If you build links on the google friendly pages, will rank your site pretty quickly.
Mostly are high PR pages. Blog or some cms sites are good for seo.

I think quality of backlink is also a deciding factor. If you sign up and you have a new blog then it would not have good rankings. And backlinks from these new blog would not be so effective.

Backlinks from free blogs are always good for a site to get well ranked up. Just try to do quality work. And if you find do follow then it is even more impressive.

Backlinks always win. Relevancy score, context, social signals, and so forth all matter; but at the end of the day enough links will almost ALWAYS put you on top.

It depends how frequently those pages are crawled by Google. First check others' post on these sites. If they are being cached by Google on time, only then you should submit your content there. Well, blogger is good, as its Google's own properly is easily cached by Google crawlers.

As others are saying, backlinks from such free blogs can certainly help. I'd add that they are best used as one part of an overall backlinking strategy. Think how backlinks would be made if they were entirely "natural" (ie. made by the public), there would be a variety of different types of backlinks from different types of sites. The more natural your backlinks look to the search engines, the more good they will do you, and as someone else mentioned, you can backlink your backlinks, further improving your results.

For some detailed free info on this, goto the site in my Sig., and click on "Free Downloads" where there is a 26-page PDF document on using backlinks effectively, which might be of interest to you.

Chris-

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So long as there's unique content surrounding the link, then it's all comes down to PR and OBL, generally speaking backlinks are everything in SEO, I've ranked sites for keywords that aren't even present on the entire site! that's how much emphasis goes on backlinks in Google's algorithm..

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Those are very effective - ever working methods regardless of Panda or any other Google upgrades. Such methods always fill up my 70% of SEO Strategies...

Backlinks are important for new sites or blogs....

I made about 30 unique articles with 2 backlinks and published each of them on different free blog services like zoomshare, insanejournal etc two weeks ago. Every article has backlinks and they are mostly indexed by Google.

No effect at all. I know it takes time but I think that making those articles with backlinks was only waste of time. What do you think?

ya its definitely help you as a back link but you have to need do some work on them if u want to consider them as a back link.

backlinks from those 2.0 websites are really good. You can use all those 2.0 websites for link wheel which is an effective backlink strategy.

Here some idea:

1. weebly give one link for website pages and other link for blogspot page
2. blogspot give one link for website page and other link for squidoo page
3. squidoo give one link for website page and other link for weebly page and complete the wheel.

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Ranked #1 purely with web2.0s.

This does not mean anything, as in which backlinks are stronger/weaker.

However, it means that web2.0s work .

Well spun content - with emphasis on WELL SPUN, works just fine provided the articles are genuinely unique. Check with copyscape first to be sure. I like to wait for one article to be indexed first before putting up the second spun article to test with copyscape that the second is seen as unique compared to the second article.

Of course this takes time, which is why I like to create at least 5 (or more) well spun articles on any given topic for back linking with web 2.0 and free blogs. This way I can put 5 articles up at once.

As mentioned above, be CERTAIN they are unique. It may take a few months for the link juice from those articles to really kick in, time is a factor.

It is also a good idea to backlink those web 2.0/free blogs really well to maximize effects. Using a mass submission gig from fiverr using AMR or the similar, or do them yourself, this will really maximize the strength of the links. I actually find this to be a fairly powerful linking strategy, especially if you do a lot of it. You can create 50 web 2.0/free blogs and back link each one of them and you will definitely build up some power. If you add in other link building ti the mix, then you can certainly expect really big shifts in rankings.

As an added note to my previous comment. If with free blogs like wordpress.com and blogger, you put together a blog with 5 to 10 articles on it, and got over a 100 backlinks to them, and keep adding a few links each month after that, they can often get to a page rank of 1 or 2, whihc is a big help since the links are going to your money site from 100% related sites. This works great.

Even better, create 5 individual blogger blogs, and put 5 to 10 posts on each and interlink them, to create internal link juice. Do the same with wordpress.com (the free version). However only interlink between the same platform, don't link wheel by linking between wordpress and blogger blogs.

This can be a lot of work, but it can make the difference between jumping over the competitions head, particuarly with medium competition sites.

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If they are cached by Google on time, the only way you should submit your content. So, the blog is good, as Google's own right is likely to be the Google crawler cache.

As blog hold detailed content and people always like to read such content source which provide complete information for their search. And now after the panda update, blog and social media plays major role in the results. so if you make use of blog to get backlinks and if you promote your blog on social media then it be more helpful for you to get more backlinks and results.

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its better to do link bait strategy to get better back links.

Effective indeed! Backlink is the King content is the Queen as the said!

if you need top ranking and traffic for your sites backlinks are very imported and google give more benefit for high quality backlinks.

Backlinks are the base of SEO in your site's rankings. Backlinks from free blogs etc like weebly.com, blogspot.com, webs.com, wikidot.com, webnode.com,hubpages.com,squido,wetpaint sites have a high PR & Google favors social networking sites.The links are very effective if they are dofollow backlinks.

These are very good authority sites, always use them!