Oh I like the I Am Who? plot idea though it could be a bit more than just "last person they talked to" to make it more interesting, I think...
Buuuuut on the music plot idea, in my personal experience mileage varies greatly with those as I've seen them done in almost every game I've been in and I find it leads to a lot of posts without any replies... If that was ever to be an event I'd suggest it be a really short one like only two days at most. THIS IS JUST FROM MY OBSERVATION OVER THE YEARS THOUGH. I find those types of events are best short and sweet otherwise they'll get dull fast as posts with people just posting lyrics can be kind of hard to reply to.
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Buuuuut on the music plot idea, in my personal experience mileage varies greatly with those as I've seen them done in almost every game I've been in and I find it leads to a lot of posts without any replies... If that was ever to be an event I'd suggest it be a really short one like only two days at most. THIS IS JUST FROM MY OBSERVATION OVER THE YEARS THOUGH. I find those types of events are best short and sweet otherwise they'll get dull fast as posts with people just posting lyrics can be kind of hard to reply to.