SMS.ac

Does anyone know anything about this SMS.ac? People keep sending me invitations and I've joined...I have a suspicion it's mostly information-harvesting, which is why they don't get any personal details from me. They don't send me mail really, except for a points update, and seem to want me to send flirty text messages to other members.

Maybe it's my deep-seated paranoia of of anything pertaining to telephones, but the whole pretense just makes me feel suspicious.

Someone tell me I'm being silly and that it's a Very Useful Organisation?