Keep getting hacked. Anti-virus/Keylogger?

I am an active Twitter user and my account is constantly getting hacked despite "very strong" passwords.
I am concerned that I may have a virus or a keylogger. I have tried iAntiVirus but is there something better? I found iAntiVirus through CNET where it came the best reviewed anti-virus for a Mac.
I'm not really sure what to do as it has been about 3x in a week of getting hacked on Twitter. All my software is up-to-date (just checked) and am running Mac OS X 10.6.8 (there is a conflict between my Adobe programs and Lion which is why I haven't upgraded to that).
Any suggestions?

SubconsciousMe wrote:
Above poster, that is noted.
I am new to this -- being a Mac user. No need to scare me off!
I love my Mac and just want it to run smoothly. I'm doing the best I can with what I know, which may not be much... but is increasing daily. Hopefully, someday I can help others. But, until than, I depend on the help of others.
There are no viruses for os x. 
User Tip:  Mac Viruses
Macintosh Viruses
It doesn’t get PC viruses.

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