So one day last month, there was a bit of a turn up in Twitter RP -- over in the Sherlock side at least.
It was called ZombieNation and I saw Dirk Gently (!) write one. I don't know how or why it came about, but it was really cool, what I saw. Another was done by one Lestrade and Molly Hooper, which turned into fan fic.
Then Vin Hampton wrote hers, while Sherlock (A Study in Punk) also wrote a few: Case File #1 and Case #2.
James Moriarty (So_Changeable) had to write one as well: Jim had been sick and Jim could only chuckle and the cabin.