Barb is my friend on facebook and there are 3 other friends from my school who know her as well but they are not on her network. so i went to barb's page and i did a friend suggest so that all the 3 friends get selected and she receive a notification letting her know that I suggested this 3 friends: Amy, Beth, and Susan. then a week later today...I get an email from Facebook telling me that Amy has added Barb and I suggested this friendship. It also told me I could suggest more friends for Barb. Now why did I get this email today? How does this work?