Or cool to give employees an understanding that employers aren't their friends and can and will go to extreme lengths to screw them over if it benefits the corporation. Also just general advice to avoid doing things on your company laptop if you don't want your employer to know about them.

That's all fine and dandy and I agree that employees should be informed of these methods. My issue is more with the framing of the post, which clearly doesn't have a cautionary spirit that informs those who'd potentially affected by a vindictive employer. Instead, it's playful curiosity of how to rat out an employee.

Alternatively, it's a warning to employees on how they might get caught.

Once again for those in the back, never use your employer's equipment or network for anything you don't want them to see!

Refer to your work laptop as your “girlfriend”.

(SV reference)

Insidious problems are things like sync (Google Chrome favourites, Dropbox etc.).

Pretty much everyone is carrying around a pocket computer connected to the internet 24/7 with which they can do all their non work related tasks on, including badmouthing their employer.

If employees cross streams and use the same device on both the employer's network and off, and they post to Glassdoor off-network with the same device, a subpoena could reveal identifying information to the employer. Glassdoor can also choose to just hand over that information when requested, as well.

How many get connected to company WiFi?

They all have the ability to disconnect with a swipe and a tap. Life does not get much easier.

Right, but I'm trying to consider the average user. They likely aren't aware their activity on their phone is being logged on WiFi. My assumption is that once they got it connected to WiFi, it leaves attention and isn't considered

Nah that's a pretty obvious way to catch people and any sysadmin knows it. Browser history is a good spot to check too.

Be smart kids. Do your employer bashing at the public library.

I'm not for it, I'm just saying - it's trivial. I was in your position, kinda - spent many weeks "searching" but "found nothing". They fired them anyway.

Pretty dumb to talk crap about your employer on said employer's hardware and/or network, regardless of how true it is or not.