Joined: 28 Apr 09
30 Aug 11 3:24 pm
Trace back any changes you made prior, such as the plugin. If you think that would have an effect, get rid of it.
Keep building links as normal.
Get into Webmaster Tools and see what Google is saying about your sites.
Check out the Panda update details and make sure that your sites are "compliant".
Keep building links as normal once you're sure everything is good and they will come back.