Don't wait too long before you know it FB will be trading at $115 or $120s. You waited for $80s and you got zilch. I would not wait for $90s you will kick yourself all the way up. Get on board the FB train and dont look back, or you will turn into a pillar of salt like Lots wife did.
This is the best I can offer. Do your DD and blame only yourself if it does not go the way you hope. I am telling you what I believe.