Spam Messages In My Y-IM

Yesterday, Ojiedapogi, a friend in Orlando sent me an IM message from Yahoo saying " Thank You" . So, I replied " For what?" then, he said " For the health information advertisement that you sent me". I am so bewildered. I also received those messages from Kittykat, Cookie, Eleanor, my brother, Marife and other friends in my yahoo list.

I also received a message from my other email add and I am the only one who use that address. Whenever I am offline, my Y IM automatically sign in to my mobile phone. One time, I was talking to my mother, it logged out itself and became online. I was so alarmed! Before I could go online to that email add, it sent the same ad advertisement again to everyone in my list and that includes me.

This is the message that i keep recieving from those name I mentioned above:
Tra lai em niem vui khi duoc gan ben em, tra lai em loi yeu thuong em dem, tra lai em niem tin thang nam qua ta dap xay. Gio day chi la nhung ky niem buon...

There is a website included and I don't want to published it. Have you been recieving this kind of messages? That is only 1, I got other versions.

Then, the other advertisement is this one:
I have been taking Acai tablets now for two months and already lost 36 pounds, it is the same stuff that was on oprah and cnn, Mike and Jen lost so much weight too with no diet or excersise. Order it now, only five dollars a bottle, we are living proof that it works like magic.

I teased my brother because his IM sent me that message too...LOL! So, I may be smiling but I am so mad of that unknown ads. Ojie said, it may be a virus. My brother said, someone hacked my password. I don't know which is right. If that is the case, it hacked all our password because almost all the names in my list have those too and they continue sending 3 days ago.

So, yesterday, I changed my password. I am hoping It will stop. Ojie even said that there are messages that are cursing him and saying bad words. He ignored it because he knows me better. Yesterday, he just informed me so I can do some remedy. I don't know what remedy actually but changed my password.