50 Web 2.0 sites for Back-links.
Websites with 2.0 attributes allow visitors to create there own unique page (URL) for there contribution/content. It is one of the most effective and helpful technique for link building but people used it for Black Hat Techniques, Website owners paid a huge amount to bloggers for back-links. also, they made multiple accounts on different 2.0 sites for back-links. The best method to get back-links for web 2.0 attributed site is contributing best and useful content on the platform. Web 2.0 has a good trust flow passage for your websites. If you make good back-links from web 2.0 attribute site it will pass a healthy trust flow to your site.
Web 2.0 consists of Social Bookmarking, Directory Submissions, Article Submissions, Social Media sites, etc.
Here are some useful web 2.0 attribution sites.
You can use this web 2.0 sites for building back-links but don't use them for Black hat techniques.
Always remember that Google loves creators who contribute to the web and if you'll try to cheat Google by posting plagiarism content, thin content or misleading content Google can give the penalty to your site. Also, try writing your own ideas and opinions.
A back-line with a good content and a good site give a better trust flow for your site, A website having Good DA and PA will give you quality back-links.
Every time when you build back-links for your site remember that it should be a "dofollow" back-link some of the sites give "no-follow" back-links like Wikipedia but back-links from such sites are always healthy and passes a good trust flow to your site.