With nearly seven million users accessing Twitter through Facebook application, was a natural step that the microblogging social network allows synchronization of contacts. The idea is very simple: through its implementation, Twitter lets you explore what Facebook friends are within the service, so that you can import. This feature is a great help, especially for new users of Twitter who do not know who to follow, preferring to leave on familiar ground. There is nothing new, but with 100 million users on Twitter and almost 500 million in Facebook, the potential is enormous. In addition, your friends need not even know you're reading their tweets: as easy as building a private list to break with the traditional symmetry of Facebook. source: www.upvery.com