I think it would be a good idea if the message you get telling you a buildings been buffed by a friend actually said which friend had buffed it. Because quite often I am online but im going between the PC and other things as im sure other people do, so if a friends buffs me and im afk at the time then i have no idea who.
I also think it would be helpful if there was some sort of timer that could be put in place so that when you were clicked onto a building thats buffed it could tell you how long the buff has till its finished.