Has anyone here caught their child chatting inappropriately online with a much older adult?

This is an offshoot of the “Catch a Predator” thread.

https://boards.straightdope.com/sdmb/showthread.php?p=21432645#post21432645

For that matter, did any of you younger (under 30 or so) posters do it yourselves?

How was it discovered, and what if anything happened? I do remember as a teenager, girls my age dating men in their 20s, and later rumors about boys being involed with older women, but this was pre-Internet.