It needs to have a single-user mode. I will not play multi-user. I won't torment my friends with Civ-related updates. "Your friend Sid needs your help to Build The Leaning Tower of Pisa." "Your friend Sid needs your help to Cancel Trade Agreements with Soren(Vikings)." And, this better be really, really cool. Not much in Facebook gaming is really appealing now. You can't shoot yourself in the foot and expect to drive paying customers to Civ5. Don't be a stranger. Toss us a bone with a message or two on the boards.