A flood of Facebook shares could swamp prices - four more IPOs worth by December

``... the price could go a lot lower if Facebook can't raise its business prospects and insiders start to sell rather than hold shares. There's more than 1.7 billion shares owned by insiders, such as employees, etc, that will be "unlocked' over the next six months and will become eligible for trading. That's a huge overhang considering that Facebook floated 421 million shares in its IPO.''