One of the Effective Link building method.
Improve search engine ranking for keywords.
It helps indexing site to Google.
Offers free space for posting content.
Gives do follow back links.
Web 2.0 is a great way to promote your content online and also build quality backlinks for your website. Many Web 2.0 platforms are used to build personal blogs to share articles, while some are also used to build professional websites for serious business.
Posting Web 2.0s provides a nice and better way to get do-follow back links. It also helps promote your content and keyword in free spaces. However, take care to see that your content is quite interesting and not just copied or scrappy material.
It is the effective link building technique that improves the optimization for a specific key phrases. It also allows Google to index the web page and offers free spacing for posting content inside site.