80% of them are under 24:

Take We Heart It, the photo-oriented social network seems to have hit a sweet spot. The service, which I’ve described before as reminiscent of Pinterest in functionality with a dash of Tumblr’s youthful appeal, now has 25 million monthly users, which represents a 25 percent boost from the number of monthly users it had just six months agowhen it announced its $8 million Series A raise.

And many of those users are young. In an interview this week, CEO Ranah Edelin said that some 80 percent of We Heart It’s user base is under the age of 24, and more than 50 percent of the users are in their teens. We Heart It is fielding three billion page views a month now, and serving over 60 billion images on a monthly basis.