csfeijo

ContentShare use the API features of Twitter and Facebook to possibility add this buttons on your blog. 
For more informations about this features see the API URLs of this Social Networks.

ContentShare

ContentShare add buttons to share on Twitter and Facebook (Share and Like) on home page of your blog and on each post.

Automattic

John Godley

Donncha O Caoimh (a11n)

Eoin Gallagher

Lenny

Future upgrades to Sharedaddy plugin will only be available in <a href="http://jetpack.me/" rel="nofollow ugc">Jetpack</a>.
Jetpack connects your blog to the WordPress.com cloud, <a href="http://jetpack.me/support/" rel="nofollow ugc">enabling awesome features</a>.

Sharedaddy

Future upgrades to Sharedaddy plugin will only be available in Jetpack.

ContentShare vs Sharedaddy