Look, I don't think that an anonymous person got into my account.
I said that there are good reasons to be sceptic and question if an acquaintance of mine got my password. I'm pretty sure that if someone really wants your password, there are ways to get a hold of it.

It's known that there are people who make a business out of hacking an yahoo/hotmail account on demand. Granted, some of it is just scam but some not.

You wanna how I know? A friend of mine once created a hotmail "dummy" account and sent a request to one of these "hackers", asking for a prove that they can really hack accounts, by sending him his own password. I want to point out that this was only for security purposes. Anyway, that person sent him indeed the correct password and my friend instantly cut off all communication with him.

I could post the email here but I probably won't since it's illegal.
Besides, I wouldn't recommend getting in contact with these people because as I stated before it's illegal, immoral and they'll most likely try to blackmail you and press more money out of you.

So let me rephase that I just wanted to know if someone had similar problems with the yahoo messenger or heard of any Yahoo glitches lately, so that I can determine in a way whether I've been invated or not.