This may be the wrong subreddit to ask this question or perhaps the question itself is a bit underqualified for this subreddit but please help me understand.
I messaged someone (we’ll call them X) on Instagram using a fake account with no indication through followers or posts that would lead back to my real account. Note: Nothing shady or illegal happening, just a joke, no one got hurt in any way or form.
Later, X told me they know it was a fake account and proceeded to tell me the device I was using and my IP address. This wasn’t too concerning as I had heard of this before. Most that would lead to is my location right?
What happened next kind of freaked me out. X told someone else who then told me, that X managed to “find out the other Instagram accounts that were connected to my router” or something like that. From that they realized who was really messaging them. Note: X does not know me in real life. I also doubt anyone who knew about the fake account told X.
How did X do that? Is there anything to be concerned about?
X can apparently “hack” accounts. Because of what happened, I also I activated two-factor authentication on most of my accounts because I was worried; is that nearly impossible to overcome?
Any help would be appreciated, thank you!