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Pascal (Hubzilla) You can think about what you like and then offer that, or think about an audience and offer what they want. If your offer is for money, do the latter, if your want to have fun do the former - you will enjoy it more.
Mastodonians have chosen Mastodon to have one image and 500 characters in a post at each other. We can show them a private post like that using OWA.
PixelFedians have chosen PixelFed to have single images at each other (?). We can show them a private image using OWA.
We could go on like this per app.
Or, we could talk about what kind of audience we have shown ourselves to be - a little bit of everything, eclectic, text oriented, image oriented, short form, middle form, long form, events and calendars - I could go on.
Medium the web site is all about long-form multi-modal text and media, some times open, some times closed. We could offer that using our web pages and wikis using OWA.
What you enjoy and what brings you joy, do that. OWA lets you offer it to yourself, a single friend, a group of friends, a closed network or public to the Internet at large.