I think an official photo album would be a good idea myself. In that topic in How Was Your Weekend are a lot of pictures, but they're really just here and there; there's no real order in them and if someone would be looking for the picture of a specific person, it could take a long while before that person would have found it. A topic isn't a substitute for a photo album, unless all pictures are being edited into the first post IMO.
I'll give this some more thought.