And when it's about to end, Snapchat warns you with an hourglass emoji. These Snapstreaks keep score of teenagers' friendships. Because teenagers use Snapchat so much, Snapstreaks are emerging as ...

Here's one example Harris doesn't cover in his fantastic essay: the Snapchat score. It's one of the clearest examples of unethical design to me, and even worse, it's targeting younger users - many ...