Spoke to Pablo at some length this morning and his decision seems to be largely driven by the number of racers who believe Facebook is the end-all and be-all of the slot racing universe. Now that he lives near a raceway and is able to race regularly for the first time in many years, he's found that his raceway owner is Facebook-centric (as are almost all raceway owners) and without being on Facebook he'll not be in the loop for race announcements, rule changes, and other info. He's also frustrated that most of the racers he meets never heard of Slotblog at all.
So, from my perspective, he's been sucked into the modern media world, where the 30-second sound bite is king. I see the world of Facebook, optimized for access from a phone, as being shallow, and Slotblog as having depth. But it seems to me that most people these days don't really want depth. They're happier with a few quick memes.
Sort of follows the traditional behavior of slot racers having little concern about documenting the history of their racing and races, as Noose as done so admirably with Retro East. It does seems to be all about immediate gratification in the modern world, with virtually no concern about history.