JomSocial 3 introduces the new activity stream for every like in the community which can potentially clutter your activity stream.and make it look like shown on the image bellow
If you want to remove those activities, kindly open this file
On the line 592 and 593 find this code
// Add logging CActivityStream::addActor($act, $params->toString() );
Delete or comment it out. It will prevent new streams for this actions from being created. Old, already generated streams will still be shown.