Do you see what I did there? Anyone on the Internet can accuse anyone of anything. And you can do the same in a court document -- when you sue someone, you don't say "I think the person I am suing is a fine and upstanding citizen." You come up with anything that sounds bad and could possibly be true, just in case you're right or the judge buys it.
This is a non-story. Facebook is shady, but there is probably no securities fraud involved.