This reminds me of a time I was having a yelling match with a guy on reddit and he started calling me names. I google searched his username and he had used it across multiple sites, several being porn sites, and he also posted his reddit user name on his Facebook and a Facebook search I found his real name and pictures of him. When I called him by his real name and linked a picture of him he immediately changed his tune. In the end he and I both laughed and thought it was funny and he was more curious how I found all those thing. I told him he used the same username across multiple sites including Facebook. He said he was a lot younger and didn’t think of those things when he originally did it. I removed any post where I used his name and tried not to dox him for others to see.