If so, how did you feel about it and what was the outcome? Did you do anything about it?
I've read a few threads recently which could be very outing when combined with information from other threads. Of course, some people don't mind, but others might not have thought about this as a possibility.
I joined MN about 19 years ago and found it addictive (long days at work, no Netflix or Amazon Prime, young children etc )
I didn't share lots of personal info but one day a Mum came up to me in the school playground and asked if I was (my first username) on MN. I was so flustered I couldn't deny it. Apparently I had mentioned something specific relating to the school. She then searched on my posting history as she had as she said 'a few suspects' and eliminated them one by one until I was the most likely.
It felt really uncomfortable, and I had been open on some threads about a few things I wouldn't want someone I didn't know well to know about. She even mentioned something in front of other people another time. When I asked her not to repeat things she'd read on MN, she said 'oops thought you'd told me about that' (still wouldn't have appreciated her passing it on).
Of course I name changed, and have changed certain details in threads or decline to provide potentially outing information (not always helpful for soliciting answers to threads).
It still has an impact on my posting style and habits so many years on. As said, I know some people won't care but so many people provide a lot of identifying info, I thought it worth people thinking about.