via meish.org
Some things are easy for users and hard for publishers, like consumption.
Creation is harder for users, and publishers take on a different role.
Interaction - contribution, if you wanted to be alliterative about it - is reacting to content objects rather than just passively consuming them. This could be anything from comments and reviews and ratings to polls and trackbacks.
Curation activities are new ways of looking at data - social data play. This can mean looking at data through a new lens (geography? time? metadata?) or arranged/organised differently (what do the members of your family look like if you lined them up in order of height? Or age? Or shoe size? Or by who you see most often?) Curation can also mean adding personally or socially contextual information.
— Meg
