Just a little while ago, I was checking something out at the CS, minding my own business, when I got a pm from a stranger. (No screenshots, darn it; I'm on an unrooted Droid X.)

But the gist of the convo was:
Him: "Give me 20000g or ill hack your account...I'm a gm."
Me: "Say what?"
Him: "Give me 20000g."
Me: (publicly) : "Hey, there's a guy here who threatened to hack me if I don't give him 20000g. His name is ____________."
(I was hoping he'd split, but he followed me and repeated his demand.)
Me, publicly: "I already reported you, BTW." Then I put him on ignore.

I thought the matter was handled, and went back to my price checking. Then, I get another pm, this time from someone who told me I had just "reported his brother, who was a gm, and f*ck you!" without the asterisk, heh.

1) Should I be worried now that I've ticked them off? What if they get friends to make false reports about me or something? And, can accounts really be hacked?

2) What the heck did they mean, gm?!?

Thanks.