It can sometimes be impossible to be 100% sure that notification is useful. For example, you might follow 100 people on Instagram, but only really care about u

It can sometimes be impossible to be 100% sure that notification is useful. For example, you might follow 100 people on Instagram, but only really care about updates from 20 of them. Instagram uses several signals to detect which people you want to hear updates from (such as whose images you favorite the most). It's impossible for them to always be 100% certain, but they do the best they can. I'd wager that about 50%+ of the Instagram notifications I get are those I feel are worth clicking on, and I'm glad they send them to be.