So, basically, there are two possibilities here that I can see:
1. Someone spent actual money on a domain, and far more time than they’re letting on (because they had to have been spending lots of time to collect all those screenshots, keep up with the theorizing, etc.), just to be a sad asshole who probably lives in a basement and wears a fedora, and accidentally ended up giving us several weeks’ worth of fun times with our friends (LMAO THANKS DUDE), or
2. Unfuckable Emily is right and it’s still part of an ARG.
Either way, the bit about how “there is no fourth episode, Tumblr made that up” fails to account for the fact that Steven Moffat coined the “Lost Special” rumor and Radio Times and the official Sherlock YouTube channel blew that spark into a flame – that is, the rumor originated outside of fandom, not with fandom – in which case, Scenario #1 involves a fedora-wearing sad asshole who spent money on a domain and doesn’t have any idea what they’re talking about, and Scenario #2 is a “doubt your own memories” sort of thing.
Anyway, ShrewdLiving.com,