my sublime directory.com a sublime directory to the web.

Is there an internal social bookmarking tool for companies?
What do I mean?

Well more the often I bump into articles & posts on the web that aren't relevant to my job, but are really relevant to my co workers, usually I IM them a link or send it with Dropvine, but from my own experience when receiving links that way you read them & when you want to share them with someone or to read it again you can't find it.