Thanks for making up this thread! That's a very interesting one. I personally have been main owner of a very popular French chat back in 2011-2013. This lead me to meet a dozen xat users IRL!
I won't list them all here but here are a few, by chronological order:
Chisame & her sister:
As stated previously, she is my fiancee. I met her on xat and we met IRL two years after (2013). It was near her mother's house 600km away from where I used to live. I was 16 so the trip was completely planned: I would sleep in her mother's house and stay for a week. I went by train (about 5h) and she was waiting for me when I arrived, so cute, I'll remember it forever in my life! It went pretty well overall since we were a couple for more than a year, we were both a bit shy at the start (and actually waited 2 days before a making a shy kiss on the lips) but this went all good. I also met her family - including her sister who was also using xat - and we went to the cinema together. We also visited the biggest city around. It couldn't be better and I'll keep good memories of it forever! Obviously, I'm still seeing them both more than very regularly now!
Miew and ShikamaruTom:
These are 2 users I also met in my chat. Miew was a good friend and ShikamaruTom was a user she knew well. The main reason we met was that she was living 20km away from my house! We went to Lyon (2nd biggest French city) in order to meet ShikamaruTom who took the train from far away, especially for the occasion - meeting other xat users in Lyon. We just spent the afternoon hanging around in a mall and talked about a few things. That was nice although we took different paths and I don't think I'll meet them ever again.
Another user I met on my chat. He was studying in Lyon and my father had to go there for some professional stuff. We simply met and went to a pub in order to discuss a few things. He was a funny mate! This didn't last very long but that was cool to meet someone from xat again.
Inoya is my age and we met more recently. She went off xat for a few years but we somehow manage to meet again on another website - the French Internet is a small word, isn't it! Nonetheless, she's not living very far from where I study now. She actually had to come with a friend of her to the city I study in so we didn't miss the occasion. We ate a kebab and then went to the cinema. Everything went as expected!
If I had to conclude this, I would suggest anyone not to be shy and try to meet IRL their xat/Internet friends. Beware, this doesn't meet you should meet the first stranger you see on the Internet!!! It can be disappointing or a big surprise but that's always a good experience. There still are a few people I met on xat I know I'll end up meeting IRL, most of them aren't using xat anymore, unfortunately.