I don't know Bob. I assume the ad tuned into the error and showed yo an ad.
the link in your post doesn't work. I cut some off and added a .com and I was taken to a "fix your pc site".
Most of those I have been to are pretty bogus or not worth the time from my experience.

Here is something thaty came up re the stack errors if you want to take a look.

Please keep your eye on it and let me know if you notice anything more.

"Stack overflow at line 26" error on facebook - Microsoft Community