Social networking sites defined as any site that allows users to create on the site and form relationships with other users of the same Web site to access their personal information public personal information.
Facebook is my favorite Social Networking site. It is mostly usable social networking site of people. It passes my time easily. I get many knowledge from Facebook. I found my many old friends from facebook. I chat them everyday.
Facebook,Google+,Twitter are my favorite social sites because it is very simple and easy to use.They can also shared videos, music, images, text messaging and many more with other people.
Stumble upon is my favorite web site for Social book marking. Because it is more popular and it has High Page rank where so many users come daily and make new accounts also which gives good traffic to the web site.