thanks for pointing out witcoin to me, BC
having gone through their offering it seems to be pointing towards a similar idea
however the witcoin service is much more generalised than what I have in mind
essentially what they are trying to create is a content-appreciation platform, however they ask that users buy into a whole lot of new concepts, including donating tipping to a range of charities.
the general nature of the site means it is by design a noisy channel (content might be ok though).
looking at the balances of earnings that contributors make there, we are talking bitcoin-cents
since there is no stated purpose of the site, it means pretty much anything goes.
(I have found on it links to youtube clips without any commentary - hardly creative, new, content, and a post offering to pay people 0.1 BTC for trolling on a forum...)
A better way to introduce the idea of BTC as a noise filter and quality incentive in my mind would be to use a focused forum (such as bitcointalk) where the users care passionately about a specific issue and where noise is a real concern, and to simply overlay the BTC interface using a traditional forum design such as simple machines or phpBB.
Indeed user-familiarity with BTC also helps in terms of potential for uptake..