If you haven't heard of
Reddit.com you probably should have. It's a user
generated social media site with categories for just about any crazy
thing you can imagine and lots of things nobody should ever imagine.
Anyway they have a vintage computer "subreddit"
http://www.reddit.com/r/vintagecomputing/ that looks like it could use a
lot more activity and content.
If you are looking to teach the young kids a thing or two about
computing history might be a good place to show off your collection or
share your knowledge. They seem to be impressed by just about anything
older than 5 years.