Your idea is already being tried by the Robin Hood Project, which has been going for about a week. See

https://steemit.com/robinhoodwhale/@laonie/robinhoodwhale-27-08-2016

It's not your fault you have missed it: the tags on the right hand side of the home page are hardcoded rather than dynamic, so tags like the #robinhoodwhale and #minnowsunite are not listed and are only known about by a few people. But the projects do exist.