There have been a lot of new socially based mashups showing up recently. In fact, we recently topped 700 social mashups. While many of these use the Facebook API or Twitter API, there are many more social APIs. The mashups below run the gamut, though, yes, also include Facebook.
Some may remember yfrog as the photo sharing service previously associated with Twitter. However, since Twitter's launch of it's own internal photo sharing service last year, Yfrog has been left worse for wear. Despite the effects of this, Jack Levin (ImageShack founder) has not accepted defeat and has bravely entered the social networking arena to meet the giants face to face.