Full disclosh: Facebook to pay shareholders $35m over IPO non-disclosure claims

So, if Facebook is the defendant then some Facebook shareholders are being paid some of their own money and some money belonging to other shareholders who aren't defendants, presumably, mostly the latter. What would be fair in these circumstances would be to make all shareholders plaintiffs. It would then be a zero-sum game except for the money that goes to the lawyers. I wonder how long it would take for shareholders to then realise that they're paying lawyers for nothing.