Next month, two seminal image-sharing communities, FFFFOUND! and MLKSHK, will close their doors within a week of each other. There's a profound difference in how they're doing it as noted by someone who's previously sold off a community.
This is a great little piece comparing and contrasting how to relatively similar online communities and social silos are shutting down their services. One is going a much better route than the other and providing export tools and archive ability to preserve the years of work and effort.