Ping.fm

Ping.fm is a free social networking and micro-blogging web service that enables users to post to multiple social networks simultaneously.

Making an update on Ping.fm pushes the update to a number of different social websites at once. This allows individuals using multiple social networks to update their status only once, without having to update it in all their social media individually. Ping.fm groups services into three categories – status updates, blogs, and micro-blogs – and updates can be sent to each group separately.