This feature will help your users promote your application. If you want to disable this feature, click on "Options > Editor > Change appearance" and disable the "Social Links" checkbox.
Note that private
applications don't have this feature because it doesn't make sense to promote something that others cannot view.
Nabble now displays social links for each message in your application. To view them, click on the "More" dropdown of any post and you will see icons for Twitter, Facebook, Delicious, Google, Stumble Upon, LinkedIn and Digg (we may add more social links if users request this on the Nabble Support forum).