That blog appears to have launched only recently, and apparently it's using the term Bookshelfie as a new twist on an old term. A few minutes of Googling uncovered a #bookshelfie tag on Twitter, but most of those photos simply show books without the person.
The blog, on the other hand, has more photos like this:
I learned of this activity via HuffPo, and while they may think it's really cool I have a different opinion.
I've never been one to like the idea of vanity shots like selfies, and that goes double when people are showing off their bookshelves. It brings in an element of book culture that I have often found unappealing.
Then again, I am a misanthrope. You probably shouldn't pay me any mind.