Siri can help you post to your favorite social network.

 If you use Facebook and/or Twitter, Siri offers a bunch of helpful options. You can say “Post to Facebook I love reading Lex and Dan’s stuff at Macworld.com,” or “Write on my Wall I love Siri,” or even, “Post I’m an over-sharer to Facebook.” With Twitter, you can say “Tweet I’m eating breakfast” or “Post I’m still eating breakfast to Twitter,” along with other, similar variations.