Chart: Most Popular Social Nets By Demo

Social networks continue to be popular with teenagers, but their largest group is actually a bit older.

At some of the biggest social networks like Facebook, Twitter, Google+, LinkedIn, and Pinterest, the largest share of the user base comes from internet users in their late 20s and early 30s, according to a new report from BI Intelligence.

This changes when you look at relatively newer social networks, however.

Social networks like Instagram, Tumblr, and YouTube attract a younger demographic, with the largest user base coming from internet users aged 16 to 24.

Tumblr, in particular, is incredibly popular among teens and early 20-somethings, with almost 50% of its user base between the ages of 16 and 24.