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Ah, with Ecency you can choose your thumbnail photo, good to know... with Peakd it's the first one.

I do love Ecency but you can also choose thumbnail with Peakd click the advanced button at the bottom of the create a post screen. The last option is choose your "cover image" which is the thumbnail.

Ah, I've been using it for barely 6 years now and I've never noticed it before 🙄