I'm not sure how effective a facebook ad would be this late in the game, and I'm not even sure how to go about doing that especially in the larger districts. In our district we distributed a few thousand door hangers and we're going to be handing out our information at every poll that we can. I'm not sure how many polls that will be, I know that we recruited a decent number of people at the freedom rally at Independence Hall yesterday.
If I was you, (and you're running) PA CD 7 (Mohnton, Paradise, Woodlyn) Delegates - Michael Cocco 4 Ron Paul - link it to the Ron Paul page, hit everyone in 7 who "likes" Ron Paul. That of course would be difficult, especially with 7, because it seems like 7 is one of the most gerrymandered districts in PA, with no clear urban centers. If I had to guess, that would be a "Republican" district. So, find a good number of your zips, and hit the Ron Paul people in those zips. And send them to the official Ron Paul page. You will find that that won't cost very much money at all to hit those people over and over.
Also, you can hit anybody in those zips. you can mention Ron Paul, or just try to hammer Michael Cocco good delegate. If you just want to hammer good delegate, get your name in front of (or to the side of) people's line of vision, I've put up a generic page to link to. But it really isn't that time consuming or expensive.
Whether it works or not, I dunno. I like using the facebook ads, but, again, I have no idea. I think what I'm going to do is to hit certain zips with the generic message.
Again, this is where I'd like research, but I don't have it. So, I'm just going to wing it.