I've set up a whole system of spreadsheets now that will make playing forum Hanabi trivial. A master spreadsheet tracks all information, while each player has their own spreadsheet that imports data (game state, people's hands) from the master spreadsheet. Players can't view the master spreadsheet, even with a link, as there is a separate spectator copy of the master spreadsheet.
In other words, this means that to play/moderate the game, you just post your action, I put it into the spreadsheet and resolve it, and everyone immediately gets an updated hand in their personal spreadsheet. You can even post in a "comments" section on your personal spreadsheet and it will get transmitted to the master spreadsheet.
With a little game logic you could probably implement the whole game and not even bother with posting on the forum, but that's a little complex for now.
Anyway who's up for next edition of Forum Hanabi?