Social media is about sharing, right? AddThis is a firefox add-on that I use often. When I find content that I want to share with my network, I simply right click on it and select facebook, or wordpress, or any other social platform. AddThis then opens a new browser tab where I can add more details to post on the wall (if it's to post on facebook). One more click, "Submit" and I will find the content shared on facebook.
Here's the link -- AddThis :: Add-ons for Firefox.