Based on shared tag, or shared liked post. Something like twitter cause I simply dont have time to check new people interested in the same type of article as me.
Intuitively I believe I dont care for people sharing the same guys I follow. But Tags!! Yes new guys with same tags selection! Want to hear about them.
EDIT: Tags suggestion is less important. Tags are easy to come by. Users, we dont even know their name. So we should have users suggestion.