Binky is an app equivalent of a baby pacifier. It presents an endless scroll of image posts that you can "like" or "re-bink" (which does nothing). It's easy to comment on a post, too. You just press random letters on your keypad to automagically generate words that write out coherent sentences.
From Ian Bogot in The Atlantic:
Dan Kurtz, the game developer and improv actor who created Binky, tells me that the idea for the app arose partly from his own feelings after reading through the current updates on Facebook or Twitter while waiting for a train. “I don’t even want that level of cognitive engagement with anything,” he explains, “but I feel like I ought to be looking at my phone, like it’s my default state of being.” Kurtz wondered what it would look like to boil down those services into their purest, most content-free form. This is what people really want from their smartphones. Not content in the sense of quips, photos, and videos, but content as the repetitive action of touching and tapping a glass rectangle with purpose and seeing it nod in response.