I remember a guy who called out sick so he could twitch stream a game on launch day. I mean, we all knew.

The biggest vector of companies finding out where you post is you telling your coworkers.

For hygiene purposes, never log on to personal stuff on the work wifi or the work computer. Best not to have the work wifi on your phone, but if you do, use a VPN.

Depends on the employer.

Some pay a service to have that included in the background check. These services pay databrokers (or the social media cos themselves,) for the information. (It’s not just email. It’s all the data you’ve ever given them. Including in posts or at creation)

That also includes you’re “login with google” accounts and all that.

Some companies just run your name through google.

Some only find out when it turns out you’re some kind of social leper and someone hates you enough to tell them.

Once you’re there and working, then some will be paying for the on going g service. But if your device is on their WiFi, or you use their devices, they can see where you’re going to post (and it’s best to just assume they see everything on their devices.)

Most not-home WiFi’s are set up to log everything.

I just saw a vid about this. How Employers Spy on You Undetected.