BRISTOL — There’s a saying that, once something exists online, it can’t be destroyed. A photograph posted to a Facebook account is logged in search records and Internet caches. Pull it down, if you like, but know that a digital copy is probably pinging around in the ether, like it or not. In a sense, that information is immortal. But what if immortality through technology didn’t just apply to photographs or old Web sites, to online dating profiles and MySpace blogs? What if we could preserve personalities, … (read more)