I think that the friends list should go all the way to the bottom of the page. It is really annoying to have to click "see all friends".
And yes i know, for some people, you would still have to click that, but this applies to most people who don't have over 50 friends (small exaggeration on 50).
Top 5 friends is pretty good to since probably 1/2 your friends are just random people who you agree with and 1/4 probably stopped playing. But you didn't check if there playing so only 1/4 of your friends are really good friends that you talk to everyday and most people don't have over 20 friends. o 1/4 of that is 5 people so its a pretty good idea.