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Private groups would be neat. I'll even take private messages as a start.

Yes! Ditto on the private messages. They would help so much. Can you do all that on a block chain?

Yes, i believe. PM already works on busy.org

Doing private messaging well is an entire company-sized task. We think that's best left to existing messaging apps, but will eventually be adding integrations to easily use/link those other accounts.

For now, our immediate development efforts are on mobile apps, to power increased conversion and retention.

That's why Busy is more appealing because Steemit doesn't understand how humans prefer to have private messaging. A lack of understanding of human nature seems to be getting in the way.

I am of the strong belief that humans do not prefer to have a 47th private messaging app on top of iMessage, Hangouts, Facebook Messenger, Twitter DM, WhatsApp, Line, Snapchat, Wire, Telegram, and Signal.

I'm not ruling it out for the future, but we're focusing on building a social experience on mobile right now that does not include chat. There are vastly better chat systems out there than anything we could ship quickly, and it's way more important that we deliver the current steemit experience (plus communities and achievements) on mobile ASAP.

Once that ships, we will re-evaluate the value proposition of implementing a quality messaging platform.

If I'm totally wrong and the feature is that much of an in-demand requirement, then people will use Busy instead of condenser or our forthcoming mobile app. The Steem ecosystem still wins. :)

Our goal is success of the Steem Platform. If steemit.com becomes successful in the process, that's nice, but it's not a requirement.

Exclusive groups with a Steem Power entrance threshold would be the most neat. As in not private in the sense that no one knows about it but only cool kids who care about Steem can get in.