Not necessarily the end, but they're almost certainly going to be diminished for it, probably because the money is beginning to dry up, and the silicon Valley rush seems to be ending.

Everyone these days seems to be trying to invest in AI, rather than just blanket throwing money at new tech companies with the hope of them turning a profit later on.

Reddit and Twitter will probably still be around in some shape or form some years down the line, but they might just be relegated to the background in the same way that Digg is.