Well, as I said, you're unlikely to find a large linkshell that's recruiting people. Generally, a linkshell has some other reason besides just doing things together for people to be in it, since it's assumed you'll use your FC for random conversation and snagging folks for group content.

Of my own linkshells I'm in... one's my coil group (which are all from my FC, we just have a separate channel so we don't spam the main log), one for folks calling out when Odin/Behemoth pops, and one for all the roegadyn on the server. That's the kind of stuff a linkshell is for nowadays, a clear purpose.