Okay, really, I don't know how much of the "extra curricular" stuff is canon. I do know that BBC set up websites to mimic John's blog and Sherlock's science of deduction. And Molly Hooper has a blog that ended when she broke up with Moriarty/Jim Brooks.
Buuuuuuut..... there are Twitter accounts for the characters that seem like that also come from BBC... and on Molly's account there is a link to ask her questions. And she makes illusions that she is with a holistic detective named Dirk Gently and that they are expecting a baby.
http://ask.fm/EmbraceChaos
So seriously, I don't know if this is extended Sherlock canon or some other red herring. Opinions?