What does it mean if someone is inactive on social media for months then gets really active for a few days and then disappear again for months?

I mean doesn't it sound weird?
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Ok let me elaborate. Like they're not posting any pictures for months and not being very active in general but then suddenly for like 2-3 weeks they post a lot of pictures and get really active and then disappear again for months? It's definitely weird.
What does it mean if someone is inactive on social media for months then gets really active for a few days and then disappear again for months?
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