This is part of paid features.
Lists with Social Profiles enabled display Influence Ratings that measure online influence of each of your subscribers. A few factors affect this rating.
- Whether the subscriber is a member of a social network and which social network(s) they're on. Twitter and Facebook contribute to the Influence Rating more than LinkedIn, Flickr and MySpace.
- The number of friends/followers they have on their social network(s).
- Subscriber activity, such as opens and clicks, for sent campaigns.
This feature is powered by FullContact.
If you have subscribers on multiple lists and want to combine your information to get a more consolidated look at Influence Ratings you'll want to look at using Groups to target your list.