When it comes to Instagram, it’s all about the likes. But did you know that something unique happens when you receive a notification on social media? Here’s the breakdown.

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Once someone gives your post a thumbs up, dopamine, a chemical associated with pleasure, is released. It’s been compared to taking a drug.

Why is that? Because the feeling is addictive. The unpredictability of how many likes you may get with each new upload is exhilarating. It’s what keeps folks coming back for more.

Watch the Business Insider video below for the full explanation.