Don't understand? why does a social networking thing affect a forum dedicated to model building? If anything, I thought it maybe we're the last of a generation of model builders, do kids build model kits nowadays?
There's literally dozens of Facebook groups dedicated to modelling, ever since I set up my own Facebook account some years ago I've been observing the drift toward Facebook and away from forums. One such Facebook group has over 24k members. Facebook has an immdicacy lacking in forums and you can post images without the need for image hosting. Lots of people are posting their work or asking questions about modelling on Facebook. One area where it falls down is in archiving. Forums can be structured and archiving is a doddle. That makes them superior for doing a build thread or posting walkaround images, the pages are relatively easy to search and find. As for junior modellers, we are by no means the last generation, there's plenty of young blood coming through.