Just sitting there reading or trying to post and it will jump to some other page automatically. Hit back and it'll go back to the forum then right back to the ad site or a fake "error" page. Some have such a short automatic-forward time that it's impossible to go back to that page on the forum.
One of them did manage to install a phony "antivirus" trick the user type of installer and set up a local proxy. It replaced the Java update scheduler and added the fake antivirus installer as a run at startup program. Overall a very lame and easy to get rid of one, when caught before it's done its dirty work.
You know the type, scare the user into thinking their computer is infected, but it really isn't until they click the "scan" button. Then they really have a mess! I specialize in cleaning up after these, so I know of which I speak.
Fortunately for me I have 28 years experience with computers so I was able to easily get rid of that.
Whomever is running this show needs to clean up and eliminate all those bad advertisements. I know ads help pay for the site, but you do *NOT* want to be responsible for helping to spread malware, viruses, trojans and other nasty things.
I know it is THIS site because this is the only site I go to currently where this crap happens.
CLEAN IT UP!