It’s the second field on the edit profile page. Can’t recommend putting it in, but victim blaming doesn’t help anyone that already did so.
The edit profile page has a statement that “providing your real name can help friends find you on the Steam Community” with no indication that doing so also puts you at the risk of capital-G Gamers. I can see quite a bunch of people thinking that that’s perfectly reasonable and not going to be abused.
This list genuinely looks like some of the marketing they had around Win7 times. No joke.
Snap? Yep, advertised feature. Touchscreen stuff? Absolutely! Better search? Yeah, advertised (and it was true in Windows 7!). New app to make movies? They got it. I guess the Win 7 page was missing Widgets. That was a Vista feature instead…