paul kevin curtis, a part-time elvis impersonatoimpersonator, arrested last wednesday spoke to reporters shortly after his release. >> the last seven days, staring at four gray walls, not really knowing what's happening, not having a clue why i'm there. when you've been charged with something, you just never heard of it, ricin or whatever, i thought they said rice. i said i don't even eat rice. >> yesterday authorities searched the home of another man who is considered an online rival of mr. curtis. he denies having anything to do with the ricin letters. >>> stock markets on edge, temporarily knocked off its axis on tuesday by a single tweet. a hacker broke into the associated press's twitter account and posted that two explosions occurred in the white house and that president obama was injured. moments after that, the twitter account with nearly 2 million followers was suspended. the tweet actually did not disappear, the false message continued to spread because it was retreated more than 4,000 times. the dow lost almost 140 points instantly. if you didn't buy or sell in that stretch, s