Wow... Mattn-san was a very early Twitter user 🤯
(In my mind, I think of it as Matt -n but I guess in Japanese it will be matsu-n?)
Discussion
Yes. My online handle name was originally hiragana 'まっつん'. I wanted to make it look like Matt'n "Roll" because I love rock'n roll, so I changed it to Matt'n, but I couldn't use single quote characters for account names on internet services, so I had no choice but to change it to mattn.