Twitter now joins with facebook to widen their reach and put social net working in the next higher level. This will allow members to show updated posts and make a quick like/tweet about it when they are logged in to their account. Twiter has 100 million members and Facebook has 750 million active users. They'd spread the like and the tweet vs Google's google+.
Now who will you "Like" most?
Google+ integrates social services such as Google Profiles and Google Buzz, and introduces new services Circles, Hangouts, Sparks, and Huddles. Google+ is available as a web site, and will be available as a desktop application, and is already available as a mobile application, but only on the Android and iOS operating systems. Sources such as The New York Times have declared it Google's biggest attempt to rival the social network Facebook. **
wiki**