Certainly I think if it was possible to post to up to five hashtags at once (and still is, even if you can no longer easily search hashtags) it should be possible to crosspost to a limited number of communities and your own blog at the time of posting.
I'm also interested to see what will happen to resteeming posts - at the moment you can only resteem to your own blog, which means only your followers will see it. If an author can crosspost and resteem, should curators also be able to resteem posts to a community or multiple communities so it can be seen by their subscribers?
I think both are fine so long as the original post isn't duplicated for rewards purposes and the community moderators have explicitly allowed crossposting/resteeming if such functionality should become available.
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RE: Where will the etiquette of cross posting end up?