The most effective peer to peer fundraiser asks the right people, makes the ask in person, on the phone or by email, and asks more than once. Fundraising is personal and is done on the ground.
If you think, posting your fundraising page on your Facebook wall will do the trick, think again. It hardly ever works. Those 500 people on your friends list are really not your friends anyway and they don't want to be bothered with solicitations while they are on Facebook.