I think giant posts for collaboration will be a great use on Steemit. Imagine hundreds or thousands of activities building on ideas, organising community efforts, etc. So in my opinion, the best way to do this is to have a lively page, meaning new messages automatically update on page just like in chat apps. Not sure if such a thing can be pulled off, but a reactive page is what's needed for flow.

I like the idea of crowdsourcing marketing, and it would be great if the community directs a portion of their daily voting power for grassroots marketing efforts.

That said, it would be great to know what exactly is the bandwidth / resources available from the Steemit Inc team too. I think frequent updates via development blogs and constant interaction with the community will be useful to keep the momentum going. Despite notions of decentralisation and such, it will be nice to have a central on-going discussion / vision that's clear on this website.

Lastly, I think the best focus for any marketing and development would be to emphasise:-

• Flow (as mentioned earlier, and I think is key for converting already existing chat groups outside of Steemit too - will elaborate this in a post. Also, a Twitter clone is pretty flowy too).
• Accessibility.
• Stewardship.

Let's supercharge these.

Edit: and not to forget user retention.. this is a more complex matter as it involves a level of utility, and I hope this will come in time.