The reason Facebook closed its first day of trading at $38 per share is because Morgan Stanley spent a lot of money bidding it up at the end of Friday. The question on everyone’s mind now is whether the bank will continue doing that this week. The buyback was part of a “greenshoe” over allotment of 65 million shares. It’s not clear whether Morgan Stanley burned through all of those shares Friday, and, if it did, whether the bank will keep buying at $38 to keep Facebook above its IPO price. Many analysts think “no.” [Source: Reuters]