This is absolutely brilliant! You can spend all day on Twitter tipping your favourite authors in Hive. Everyone loves receiving money. If enough Hive users go and tip certain popular authors on Twitter (and elsewhere?), they will be motivated to create a Hive account to just get the money. What's absolutely crucial is that a really great landing page be built for people to be easily able to create an account. Hive is perfect for tipping. I hope you can add other mainstream platforms in addition to Twitter.
You could try Quora next. There are tons of great authors there who consistently post very high quality answers.
Yes, we have Quora, Medium, and a few others on the board of possible pursuits to expand the Hive Nation. Thank you for the comment! Looking forward to its adoption!