Dead People and Facebook

About two weeks ago, my friend Robert passed away.  I never actually met Robert in person, but I had known him since I first started writing at BoA (about 6 years ago) and we emailed several times a week.  Anyhow, for some reason for the last couple days he keeps showing up on my profile page on fb in my friends.  I have over 1000 friends on facebook and since they upgraded it I have noticed that it is the people that I communicate with the most and most recently that show up on my profile page.  Of all those "friends" there are only about 25 that seem to rotate on my profile page.  So it seems odd that Robert keeps showing up there since obviously I haven't posted on his page or he visited mine in about 2 weeks.  Even when he was alive we communicated mostly with email and only very rarely facebook.  Well, and every once in a while Jerry E. Smith shows up there and Jerry passed away over a year ago.  Yet, there are literally over 1000 people that never show up there.  Just weird.