The app in the market states it is for 2.2+ so I am guessing that means only phones with 2.2.1 can use it which for us EVO users who only have the base 2.2, we are left in the dark for the Push Notifications.
However here is where it gets sketchy. My wife and I both have EVOs and both phones are up to date on the same versions for Android and the new 1.5 Facebook app. Mine gets nothing in regards to Push Notifications, but hers however gets them all and almost instantly. She gets wall posts, comments, likes, requests, you name it. I am debating whether or not to do a Hard Reset to see if that helps at all, but do I really want to go through all of that just to get this app to function properly?