The red hot startup of late, Pinterest, certainly has a friend in Facebook. Users of the pinning site can sign in with an account from the dominant social network. In a new post, Facebook suggests it's Pinterest's inclusion in Facebook Timeline that is driving its growth.
There are now 700 social mashups in our mashup directory. Social apps are growing quickly, as we noted when the directory reached 5,000 total mashups. Social mashups now make up 9% of the directory, up from less than 3% in 2008. The growth has been pushed forward primarily by two social stalwarts: the Twitter API and the Facebook API.