As someone who hung out on IRC way back in the 1990s (and internet-knew Limor from Adafruit back before her handle was Ladyada) I associate this writing style with the culture of a lot of the hacker-related IRC channels I used to hang out in back then.
Some of the same people from that era did in fact turn out to be tech founders and maybe that's how it got carried over into the Twitter-verse, but it predates that.