Hi there.
That's sounds like you have a malware pluggin installed in your browser and has nothing to do with Tapastic. You may have gotten it by installing a program from cnet or some other download site. I can assure you it has nothing to do with Tapastic. We would never allow or even consider doing something like that.
From personal experience, trying clearing all your web history, cookies, and such. Then make sure there are no fishy plugins installed in your browser. Also, check your hard drive for any suspicious programs and uninstall them. That's my techie advice for you (pushes up glasses)
Hope this helps.
Good luck. Gotta be careful these days on the interwebs.