IM has never been "hacked". The server, the forums, the wiki, probably some other stuff, yes all been "hacked" at some point. All of it was a huge PITA and caused a lot of "the world is burning" responses from me and mostly Shasta.
But IM has never been "hacked". More because of the size of the community than any particularly brilliant security on our side. Basically security through obscurity. You keep insisting that there are hackers messing with you or the community but hear me when I say I am 100% sure (100%! I don't throw that number around a lot) you are misattributing technical difficulties you don't understand and refuse to Google for "hacks". This feeds in to your persecution complex/paranoia, which are issues you know you have, so hear me and start dealing with your shit. Absolutely no one cares about you as a person enough to "hack" you. You will be subject to all sorts of viruses, trojans, adware, and malware, but they're not targeted at you as a person. They're targeted at you as a machine attached to the internet that can be turned in to part of a botnet.
The closest thing that you will ever face to a personal "hack" is phishing scams (designed to steal your login info for banks and games and shit like that) and people digging through your trash IRL to find bank statements. Even then if they can't figure out how to extract money from you, they leave you alone.
That's not to say you weren't "hacked" by other players from an MMO back in the day. My friends and I used to try and trick each other in to running various EXEs that were infected with trojans that would let us control the other person's computer. Things like opening and closing the CD tray and setting up keyloggers and shit. But all that stuff gets caught by antivirus software. It did even back in 2002 when I was doing it but especially now. Keep your anti virus up to date and running, don't run EXEs if something tells you not to (Chrome will scan for known trojans and viruses when you download attachments, for instance), don't download and run warez unless you're willing to get infected, cause that shit is rife with it, and have your PC behind a firewall and LAN (ie: your router), and you basically can't be hacked in the way you're thinking. All your personal data, passwords, bank information, money, your very soul, sure all vulnerable. We live in the cloud. But no one's gonna mess with your machine.