by Andere Richtingen » Mon Jun 25, 2018 6:21 pm
Don't know how old your grandson is but, if he has any specialist interests (electronics, old cars, model railways, parrot breeding, etc) then he should just Google the subject he's interested in + Forums and see what comes up. Generally, such groups welcome new members in any age group so long as they've something interesting/relevant to say.
He might also like to look at [url]forums.digitalspy.com[/url] which are often pretty weird but he may find something to amuse him.
I don't know of anything more general that's aimed specifically at a younger generation.