Your observations are right on target - they are certainly using multiple user names. They haven't just "disappeared."
To my fellow New Yorkers:
Please stay very alert of your surroundings.
Keep supplies close.
Keep open a way of communication with loved ones.
(If possible)
From the FR NYC Terror Thread:***
http://www.freerepublic.com/focus/f-news/1182592/posts?q=1&&page=151
A friend who works at one of the alphabet agencies near DC said this to me on Friday afternoon about transportation along the eastern seaboard: "Do not fly, do not take a train, and (expletive deleted), do not go to New York any time soon." Unfortunately, that's all he would say.
You noticed too... Some of the screen names have been dormant for months, and all of a sudden they become active on the TM just as some of the the other, well known names disappear. And then there are the screen names created in the last few days, but even though they are newbies, they know the lingo and write with a familiar style and as if they have been posting here for months.