Multiplicity/Production Project B

In the tutorial today we need to think up an idea for a website or service that somehow utilises Multiplicity.
Multiplicity is based on the idea that the whole is greater than the sum of its parts. Websites such as youtube and wikipedia rely on this idea, as by combining what all their users have contributed they have more than any single company could create in terms of hours of footage and difference of opinion. Essentially Multiplicity is about democratising websites, for good and for ill.
My own idea for the tutorial is a system of organising meetings for a large amount of people. This is based on the idea that by collaborating on when a meeting should be held, more people may be able to attend compared to if a single person dicates a time they find appropriate.