I'm going to show my age a little / Luddite side: I never got into Instagram and I honestly don't quite get how it is used / the use case. Early on I thought

I'm going to show my age a little / Luddite side: I never got into Instagram and I honestly don't quite get how it is used / the use case. Early on I thought it was a fun photo sharing thing but I see people make announcements with it, blocks of text, people telling stories-ish? Someone will tell me that so and so announced something on Instagram and I'll go look them up and ... I get pics of them just hanging out in their house / no announcement. Twitter, facebook, other platforms I get, Instagram / that style seems strange to me.