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It isn't clear from the title but becomes clear in the second paragraph:

She's saying "I'm done trying to use social media for commercial purposes".

She is no longer posting personal content on social media apps either. She will send you stuff via her newsletter though.

But that's more than just abandoning it for business reasons.

Sure but she's frustrated because she's trying a use case that does not apply to most social media users. You can have a miserable experience in competitive races but it's a bit heavy handed to swear off jogging entirely.

Is this an email newsletter? I’d never see it.

I think the entire point is that to find out about it, you have to have a much higher level of interest in the topic than someone who would find out about it via algorithm and virality.

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