Comment by biophysboy

I'm not a web developer, so I'm curious to see if you guys could answer this for me: why are social media feeds so narrow on desktop now? Both Twitter and Reddit have feeds that are less than 1/3 the width of the screen. Is it because advertising feels more sparse if you pepper it along a long skinny string? Is it because they are using inflexible design frameworks for all devices? I seriously don't understand, I hate it, there's so much wasted space.