Big changes to Facebook announced Wednesday

Social media sites were buzzing on Wednesday after Facebook CEO Mark Zuckerberg  unveiled three major changes to the social network.  First, the site is allowing users to  download all the information they post to Facebook. Second, an “ apps dashboard ” gives Facebook members the ability to see how many applications they’ve allowed access to their data. Third, and perhaps most notably, the company has completely  overhauled its groups. “It’s…