If you are not on Facebook or Twitter, you must be living in a cave. This is the age of social media and social networking. To spruce up your social life, here is a social browser too. Meet RockMelt , the social ‘Facebook browser’. From the developer blog - RockMelt does more than just navigate Web pages. It makes it easy for you to do the things you do every single day on the Web: share and keep up with your friends, stay up-to-date on news and information, and search. RockMelt is backed by Netscape founder Marc Andreessen and has entered a private beta today. It lives in the cloud and uses Facebook authentication to synchronize a user’s browsing experience across machines. Your settings, bookmarks, etc., are all backed up online. RockMelt is built on Chromium , the open source project behind Google’s browser. However, as a Chrome user, you will notice three biggest changes to the browser as RockMelt is built around friends, feeds, and search results. The left rail is for friends...