I already wrote this elsewhere, but I'll copy it here, too:

In the Farmersburg School Questions Show, I just heard Fraser say, that if you go fast enough you'll turn into a black hole. Is that really so? I remember reading somewhere before, that speed does NOT really increase the mass of a moving body. Momentum and kinetic energy, yes, but NOT the mass. And that the whole concept of "relativistic mass" is just confusing and not really needed.

I happened to find a couple of links that say just this:

http://math.ucr.edu/home/baez/physic...lack_fast.html
http://math.ucr.edu/home/baez/physic...y/SR/mass.html

Are these just plain old BS then?