All of our digital ephemera (photos, blog posts, emails, reviews, tweets, code, and accounts) and so forth can theoretically last forever. In reality, disk drives and servers can die, domain registrations will expire, data formats will become outdated, and more.<p>Even if you have the bits and you can read them, you may be faced with a excavation job. Who has time to dig through someone else's email? Are we generating more data than we can process or appreciate? I just checked my family camera archive -- 279 GB, 135,042 files. When does this legacy turns in to a liability?<p>At some point, long-running sites will have to start making some interesting and difficult decisions. They can start to purge the seemingly dead members, they can have a way to flag a member as alive or dead, and they'll have to report their membership as 10 million live and active users, 20 million dead [and presumably inactive] users.