I mean.. I saw the border agent searching my name on Google years ago (let's say ~2005-2008-ish) when I was entering the US from Canada (one of the Vancouver-area border crossings). They looked at my website or myspace page IIRC, I forget what. I could see their screen which was tilted slightly at an angle such that it was visible from my position outside the booth/window. BTW, this wasn't for any reason or anything, it was a totally normal crossing and they just started looking up my name on the web as if it were standard procedure.

I'm sure that's all automated now, they probably get a nice listing of data they have on you the moment your passport is scanned at the border. Who knows? Maybe now they'll get a 3d avatar of your face because it's been scanned at the airport of any allied country, because you had the audacity to travel out-of-country and are now subjected to unprecedented data collection.

US customs had me give them the credentials for my facebook profile back in 2017, so it's not that uncommon.

Edit: I had mentioned twitter as well originally, but I think what happened was I told them my twitter password was in my password manager and offered to get it off my phone (in their possession at the time) but the guy said it wasn't necessary.

For context, I was a 22 year old student travelling from my home country in the caribbean to the US after summer break. Also for context, I'm brown and have a muslim name.

you have a strong passport and clueless what other people go through.

US Customs screen your social profiles and for some people they check everything on your phone

I'm fairly sure the US does this