Apparently recruiters have upped the aggression to cold calls in the middle of the work day. I ignored it as I didn't recognize the number, then received a follow up email, where rather than saying they have a position I "may be a fit for," (I'm not even passively looking now, FWIW), but they wanted to see if I might know anyone they could "network with."

So they cold called me in the middle of the work day to see if I could do a basic part of their job for them.