Depending on your particular bent, there are several USENET news groups related to various model activities.
There are also a goodly number of Yahoo groups which focus on specific areas, such as giant scale war birds, Futaba radio systems, etc. You can read most of the Yahoo groups (mailing lists, actually), but most require you to join before you can post.
An advantage to the Yahoo groups is that you can tailor your participation : receive a digest of posts, receive no posts, receive all posts, and so on.
Best of all, the Yahoo groups are nearly all moderated and a lot of the nonsense seen here is not permitted. Those who won't abide by the specific group's rules get tossed.
Some of the Yahoo 'groups' aren't; many are one-man shows and as such are seriously limited in content. There are a few which have a fairly high number of respondents, and which are quite rich in information exchange.
Finding a group to your liking in Yahoo can take some time, but it's usually worth the effort. Cheers, Fred McClellan The House Of Balsa Dust home.mindspring.com/~the-plumber