Wow, I didn't realize the theft of stories was such a big problem, I'm kinda new to the online posting game. I did do some magazine publishing and the trick there was to send yourself a certified copy of your story to prove you had it before you shopped it out - saved me once. But since I don't really sell my stuff, I'm not that concerned about plagerism, I write more for me now. But if you use a site that doesn't time stamp, email it to yourself before posting it.