Paypal has changed it's user agreement and policies in an attempt to stop class-action lawsuits.
Unless you opt out: (1) you will only be permitted to pursue claims against PayPal on an individual basis, not as a plaintiff or class member in any class or representative action or proceeding and (2) you will only be permitted to seek relief (including monetary, injunctive, and declaratory relief) on an individual basis.
So uh, looks like Paypal's pulling a Sony. I don't think I like this fad.