I never add the ones that do not add an id,,I call them spybots.... I really don't think they are real players, automated , maybe not enough players or thrown in to slow corn the real players causing a person to spend money which I don't do. After I got suspicious I deleted all on my friends list a while back.
I don't remember how many, I have a good streak going now, I'll check back. K I N G, got my last streak because there weren't enough moves and kept shuffling the board till it kicked me out,,,,very unfair..