I've been making intense efforts to bring in some colleagues, which is all good (I hope) and fun, but ultimately limited, since each of us non-superstars only has a limited number of contacts. Thus I wonder: what is the policy on recruiting new users, in particular from other SE sites?
I see a significant overlap with the quantum-information tag in PhysicsSE and with the quantum-computing tag in CSTheorySE, and I'm possibly missing others. Is it OK (and are we supposed to) visit these sister sites and let people know that this specialized site exists and that it needs their participation to keep existing? (If yes, I assume this would best be done by users native to those sites rather than by SEnewbies such as myself) Or would this be considered as some kind of (frown upon) spam?