If they're smart, they'll HTTP 301 redirect these old URLs to new ones, if they ever decide to change them. URI design is hard, especially when you're dealing

If they're smart, they'll HTTP 301 redirect these old URLs to new ones, if they ever decide to change them. URI design is hard, especially when you're dealing with a single namespace on a site with massive scale like Twitter. But if everyone has their own namespace (it seems Medium is a good candidate for this), then you could as well use a human-readable timestamp in UTC (yyyy/mm/dd/hh-mm-ss), but they might be an eyesore for some. The fashion these days tends to be short, mixed-case, untypable URIs that don't look like they'll stand the test of time.