It sounds like seppukoo does in fact spam all your friends. I'd be a lot more sympathetic to them if that weren't the case.
/sarcasm
Hey in yovile you gota send messages to friends for cash. So... What everyone winds up doing is sending "asd" messages to everyone on their friend list every day.
Sure, thats not spam, its "asd".
after a couple days zapping spam, facebook becomes about 100x more compelling.
Farmville lets you send invites to all your friends. But I assume you have a choice about it - invite all your friends, or none, or choose some to invite. And it's always one of those "you have an X invitation" things which you can ignore because you know the content without looking.