No h1srf I don't know anything about merrill shorting it, I was responding to wkasel's assertion in the second post of this thread that they did so. I have done no research regarding shorting on fb in this period.
However Morgans would have made a double killing in the post-ipo period having oversold the allocation and now being able to fill those orders cheaply on the secondary market (assuming they didn't issue new stock to fill the orders)