Dunno what the stance is on using social networks here, but I think it would be nice to build a comprehensive Facebook page for Crossfire, with links to SWAT, ModDB and other places... Would be nice to promote it there, with screenshots, event notifications, etc.
I found an old group - https://www.facebook.com/groups/crossfire1.82/ but it doesn't see much action these days. Also, I have no idea who the admin is...