Well, I am the OP and my answer would be biased.
The question you linked for duplicate deals with the general perception that may be remote workers are slacking off.
In my particular case, my team was working properly just before I (and only I) encouraged them to use Stack overflow (not just for reading posts but for posting answers) and then it seems that they become addicted to it some what like gaming. I tried formal and informal avenues to address the issue, but nothing seems to have any effect.
Now, how is that different to workers spending time on facebook or news.
Stack overflow has been beneficial to developers in increasing their skill set and benefit the productivity. Usually one would learn about new things, better coding skills and improve the communicate skills. Because of that particular reason, my team didn't consider this as slacking off. As long as they were spending a reasonable amount of time, it was ok. But when the balance shifted more towards Stack overflow and less towards work, we started seeing problems and hence the question.
Is it upvoted that much simply because of it containing the word Stack
Yes definitely it is. But spending time on SO is different that spending time on social media, news or any other activity which would relate to slacking off, since SO involves learning.