I'm trying to add a Facebook Like Box from the FB developer's social plugin page. The first thing the code asks me for is the "Facebook Page ID." Of course, when I click the help icon, it simply says "The ID of the Facebook page for this like box." Uh, thanks, that really explains it. Those wise guys.

Anyways, if anyone could help me find the ID of a Facebook page, I would be very grateful. By the way, the page is already aliased, so the ID doesn't show up in the URL as it does with un-aliased pages (those withour usernames).