Yeah, I did notice that you can't edit past posts- even to add tags!
In light of that, I reposted one of my older posts, in order to tag it. https://steemit.com/investments/@crypt0/minnows-dolphins-and-whales-the-importance-of-steem-power-repost-for-new-steemit-members
I also hope that we can get some of the big guys onboard- they have just as much incentive as you or I! Cheers, liberosist!
As a Redditor, I'm not comfortable with reposting! But I'll certainly consider it.