there could be a thing on the front page that tells you things going on like Player just added UnlimitedDragon to his/her friend list or Player just entered the top 100 things like that about us gamers
This could be in reference to following and automatic updates that AG3 will be having in the future, where it will show the user if another is following them. As for adding to the friends list, that will be purely mutual, so yeah, you would have already known if someone added you! This thread should cover it:
Our activity feed will hold information like that, though I doubt we'll show too many activities in the way of "SomeoneYouDontKnow just became friends with SomeoneElseYouDontKnow" ... we *may* do it if one of them is a friend of yours.
High scores, shared game content, achievements, etc., will all end up in the activity feed, and users will be able to comment on them.
If we do have some kind of activity feed, will there be a way to filter it (or turn it off) if we don't want to be notified of certain things (or anything at all)?
I'm not sure if Larry has plans to allow users to just post general notes, like a facebook status message, and allow other users to comment on it. As I understand it, the activity feed is going to be more about high scores, achievements, new shared game content, etc, and users will comment on those (if they choose).