A couple of notes about the Like mod:
1) Like is not enabled on 'Chatter', 'Testing' or 'Posting Games' forums, just like posting counts are also not enabled there.
2) I've not enabled the 'notification' features so folks shouldn't wait for emails to let them know that their posts have been 'liked' .. seemed like a waste of email, and we'd already had a battle with the hoster over alleged-spam emails, so no need to create additional notifications.
I'm still a bit uneasy about the usefulness of this feature in the long term -- I suppose only this trial run will let both supporters/objectors to the feature see how it all works out. If it emerges that it is largely a detriment to useful knowledge exchange here, then I'll be happy to 'pull the plug' on it, and you can revert to just doing a posting with
to evidence your approval.