This should be the 1st add-on installed after installing Joomla!
If you're looking to add similar functionality for Facebook, step up to the commercial Pro version. It's a small amount for a very powerful tool that gets the job done with no hassles!
Our website's community is already abuzz since implementing this extension - we have been able to drive users back to the main site instead of duplicating articles on Twitter and FB.
Great tool - you won't be disappointed....