Both, actually. I read the wiki article, hence the clock-dice suggestion.
So I kinda gathered that in the original, there was a limited amount of cards/clues (who/where/what), and everyone got three cards, taken from a pool total. Three cards were put away, and the players were using the cards they have as proof to a suggesting player that the card cannot be one of those put away, because they had it with them.
What I didn't understand though, is if everyone had three cards, and the pool total was constant, then how would you play it with a different amount of players? At some point there would be more choices to choose from than the players could disprove. Something else had to happen there.
As for the forum, well, I suppose you can't do it in any other way than with PMs. But, maybe to avoid constantly sending out PM's, you could "get smart"? Go look at the random sequence generator over at random.org. The 33 cards that we will have in play (3 hidden, 30 are held by players) can be numbered 1 to 33 in a bajillion different ways, way more than 10 at any rate.
Set a list for every player, by firing up Excel, typing the list of cards into a column, putting in the numbers in the sequence into another column, then sort by the numbers, copy and paste into the message. Thus, in the first PM that you will send to the player, containing the three clues that he has, you will also send him a list, his personal, randomized list of the cards available to him. You, of course, will keep all the players' lists in the spreadsheet. And then you can just post this message: "Player 3, Player 2 denies your claim by showing you card 23". Player 3 will look into his first PM, and see that card 23 is an adamantine pick that he suggested. And since everybody has different lists, nobody else will know what was shown, only the fact that it was, and that player 1 had nothing of it.
Edit: just tested it, and it's even easier than I thought. You can gen sequences of 1 to 33 very easily, or you can instead put the stuff into a list randomizer, and work with it like that. Excel also automatically arranges either the sequence or the list output into individual cells, without any manual typing (except entering the initial list) required.