Not sure what device/platform you are working in (laptop, ipad, android, etc), but I use my ping.fm account in various ways and I believe it does what you are asking. Either through the AddThis addon in Firefox or Android, or within the share button in Feedly (my chosen laptop google reader client).

It grabs the page title and creates a shortened link automatically, then you get the opportunity to edit before posting. It feeds virtually every social platform available.

Good luck and let me know if I can help further!