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I usually use Steempeak for every post where the pictures matter, which is basically 99% I do here! Will it work like before and be seen in steemit.com also?

Of course! Now with this communities thing, notice that in your profile you will see the "posts" tab, that's where you can see the posts you make in a community.

All posts you make on steemit or steempeak are visible on all front-ends, but steempeak is currently much more comfortable and easier to use than Steemit.

I like to post pictures through there, but after almost three year on here, for reading posts and commenting, I still prefer Steemit 😬 I tried Steempeak and Busy, but I really grew to love the simplicity of Steemit for communication.