I have been a member of Corvette Forums since 2003. It and this one are the only two left that I visit. All the rest died. Corvetteforums used to be pretty heavily policed, then they had to step back on that to keep people from leaving. Still the best source of Corvette info.
There must be 8+ Nostalgia groups on FB, including Lions Dragstrip, Nitro Revival, Front engined dragsters, Etc.