Hey Erica, thank you for reply, and i am glad to hear answer from you. I usually read your posts on Moz.
But unfortunately , I have to contradict you. When we talk about a great number of likes , we can not put into account the possibility of mass unsubscribe or unlike/dislike. Chance for this to happen is too low. Even in a political showbiz likes will not acquire 0 (zero).
Somehow, not knowing how they(the likes) appeared again. You can check it here.
I have a bar in style of hellobar.com , and i can say mine is upgraded :))
We can leave this like a mystery, but in fact i have some theory about it. I think somehow they have great connection with paid campaigns on Facebook. Maybe someone who really care about SEM, can confirm that. If a campaign stop, likes gone away ?