Some 82% of Millennials (people age 18-29) interact with brands or retailers on social media, where 49% follow their favorite brands or retailers, according to the following USC Dornsife infographic.

What do they know? Social media strategy firm Hasai put together the infographic embedded below after deciding to find out. Not focused on the individual bits of information -- phone numbers and ...

To make that data more accessible, AdAge's digital team built out this infographic, which breaks down who is using some of the most popular social media services, from Facebook to LinkedIn to MySpace.