A quick review of these sites in 2013:

• use Perl; - suspended since 2010.
• JavaJunkies - gone (discussion)
• /. still there, but increasingly just a mouthpiece for its new recruitmentco overlords
• LJ still going
• AIM is amazingly enough still going.
• Usenet lives, but under the increasingly shadowy hand of Google.
• Less said about CowboyNeal's festering laundry pile the better.

The thrivers appear to be LJ and PerlMonks. Content is king after all - who'd have thought?