Stalking or Browsing

I was discussing with one of my friends about how two of my colleagues were stalking or browsing a previous employee’s Facebook page. I shared that how one person was sitting and the other person was standing and I passed by after dropping something in the mail. One of the individuals looked at me as she saw a ghost. However, the other person did not react and stayed calm. 

Anyways, my friend’s perspective was interesting. He said that what if they were just talking to each other and the page was just open. It could be because that previous employee must have posted something in general or related to his previous job. He said that may be it was a coincidence that two colleagues were standing talking to each other  and the page was just posted there. I told him about the controversial post of the previous colleague a week and a half back. He said that may be that was it. 

He said that not always everything is stalking sometimes it is browsing too or sometimes it is both browsing and stalking at the same time. 

But my last concern whether social media should be open constantly during work hours.