For account creation i'm using softwares. But for content posting i do it all manually, no spin only good quality contents.

Every joe and his mom has a tool for web 2.0 creation nowadays. Senuke, UD, Magic submitter all do it nicely. Use their macro recorder to code your own sites and automate their account creation.

Btw you should need one except when you are thinking about spamming or selling web2.0 accounts. Do it manually , its worth the time because softwares just create account , they don't personalize you web2.0. If you understand what i mean!

You can use a software, or as you are saying you can buy a gig from fiverr.com.

Here you have two ways:
Go for a Fiverr gig or
a S/W

Yes, it would be good if you post fresh content to web 2.0, I haven't used any tool for creating accounts as they come under black hat method.