I have stumbled upon the solution to the "re-adding facebook friend problem" that many people are facing after reformatted or deleted the XMS folder.

Here's what you'll need to do. Click "Find Facebook friends" on your ebuddy xms, then when you landed on the facebook login page, select another language (I picked Bahasa Melayu) after that select "alternative login method". Next, key in your login ID and password, walla! your ebuddy XMS will start syncing with facebook again. This method also worked for the same problem I faced with Colorss.

But push notification is still yet to resolve =( it works someday for me.