Dear god I hope not. I guess I am sheltered as an engineer? I would say no to anyone so fast if they asked for a Facebook or twitter account, and I never have heard of this. Do you have sources on this being a prevalent practice? Have you been asked? Edit: unless you mean Linkedin or something like github as a social account?
unless you mean Linkedin or something like github as a social account? Those count, unfortunately. But I'm skeptical that a "github resume" matters much. LinkedIn seems to matter a lot more strictly for getting offers from recruiters, though.
One of the great reasons not to have a LinkedIn account. Those aren't offers any way. They're just shotgunned spam to users with > 10% keyword matches.