Communispace does not offer invites directly. I got my invite to my Communispace panel from Surveyspot (there are benefits to taking their sweepstakes surveys, all you SurveySpot nay-sayers out there
). SurveySavvy and FocusForward offer invites as well - as a matter of fact, these are the only invites I get from them these days, and I never qualify because you can belong to only one Communispace board at a time.
A Communispace invite does not say communispace specifically, it will contain a company logo of the community(Kelloggs, Pepsi, etc) with an invite to join a private online community of 300 members.
The screener questions ask about memberships with other online survey companies. Either they added that question after I joined, or it was not asked for my online community screener. Had that question appeared on my screener I never would have qualified.