Idk if this officially came from the show or not (the headline seemed to indicate that it did, but I have my doubts), but here's an interesting graphic about The Six Degrees of Joy.
The "lines" indicate that Rhaegar is Jon's father... we know that already, based on all the evidence in the books. But if this graphic came from the show (and it DID come from the verified GoT Facebook page), we do NOT yet know that in the show. An interesting move for the inadvertent reveal.
People who haven't read the books only know Rhaegar by name, if at all. But the graphic seems to confirm him as Jon's father. If this indeed came directly from the writers of the show, it's basically a service to the readers, and it seems they are well aware that shownlies probably weren't gonna pick up on the significance without being explicitly told at some point, anyway.
So, while this appears to have come directly from the show, and they're confirming what readers already know, it's still kind of a bummer that they revealed it *officially* through an infographic, rather than waiting to put it out there in bold during season 7. That's why I question as to whether it actually DID come from the writers, or if they simply approve what's been laid out in the graphic.
Tower of Joy Infographic Spoiler