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You can join the community and then browse it in your community feed (at least on https://steempeak.com).
If you post/cross post into a community it shows only in the community, and not on your blog. You can also make a post and then cross post into a community. Or cross post other's posts you find.

Best interface by far is @steempeak.

About anything that requires members to post

That's why I wrote to you, and others ;)

okay maybe i will try it :)

How does the system work there, like I'm interested

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