I'm sure replying to these will do no good.
They appear to be from someone who signs up with some weird name, spams everyone via PM's, and then disappears.
Just delete them if you get something from someone you don't recognize. And please be aware that "Yestalk Forum Administration" is NOT sending you PM's about virus software, etc. LOL
If you ever get something from YT as a whole, it will probably be from Ed or N2yes, whose names you will recognize.
Anyway, I keep reporting these to the mods, but so far, no one with the "power" has shown up on site to take care of the problem.