When someone you're friends with on a social network takes too much of an interest in their profile (generates an excessive amount of posts) or in your profile (generates an excessive amount of comments on your profile), and you contemplate terminating the "friend" status.
Contemplation can also be due to terminated relationships, etc.
Girl 1: Oh my God... Becky is so annoying on Facebook. She comments on like, ALL of my pictures.
Girl 2: I know, right! Right now she's Pending Unfriending.