Hear me out guys, I'm not talking about full blown twitterification.
You know how people make those super long nested quote threads? They're more or less already functioning as "@username" callouts...you can get a PM when someone quotes you, and you can even choose to disable the alerts.
So why not just allow us to call out someone by @username'ing them?
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Got any of these for sale? Sell them to me. I also buy other NES Publisher inserts, and even GB/GBC, and SNES inserts too.