There are a few ways to tell if someone is active on Instagram. First, look at their posts. If they’re posting frequently or if there’s a lot of variety in their content, they’re likely using the platform to share interesting and engaging content. Additionally, if someone is following other people on Instagram, it’s a good sign that they’re interested in what the other people are up to. Finally, look at their followers. If their followers are high-quality and evenly dispersed across different platforms (like Facebook and Twitter), they’re likely keeping up with the latest trends and happening on Instagram too.