Great insights! I think using the tags to aggregate the community content is an excellent solution. Today there is a problem with the long url adress like steemit.com/created/tagname that become difficult to brand and spread. It could be possible to overcome this using a third party custom url shortener like tiny.cc/tagname or bit.ly/tagname. This also could work like a owned tag if the tag were original or branded enough. If you're interested, I also wrote about this issue (Steemit Knots idea) refering to Orkut Communities, Facebook Fanpages and Groups and Medium multiple users "publications".
Congratulations, thanks and good luck again!