We could host the challenges on a Facebook page. We could post the challenge on Monday and encourage everyone to add their photo to the album for that challenge during the week. It would post on the wall of those who "Like" the page. We could also announce Blog Hops, birthdays, or whatever there too. Facebook allows us to have multiple admins. You can also control what type of person can post to the wall, comment on things, or add photos to albums. We can make it so anyone can see the page, only followers can comment and post to a challenge album. THOUGHTS??? A week or so after the challenge we can then post those photos to Pinterest all at one time. Though someone would have to save them to their computer or find them all on a blog post. (Again, I do not want to create more work than necessary for anyone). I think two weeks is enough to participate in that challenge and be included on the Pinterest board. People can always continue to add to the Facebook Album after the two weeks is up. You can also just give people one week, since we will then have a new challenge to participate in.