all the time i find someone that i have something in common with and it does not let me communicate with them in a message form or even whiteboard.
now that really annoys me,
No, it amuses me that they forget that they have blocked me when they send a nice message, so I have no way to say thanks. Still, amusing, not annoying.
Technically, not blocked, but come on, you still can't communicate.
Yeah it happened to me yesterday. I'm not sure they are aware perhaps?