[amelius]

Better solution is to let users solve a complicated CAPTCHA when they want to tweet longer messages. That way, there is no social pressure to make long tweets (no reasonable person can pressure you to solve boring CAPTCHAs), while it's still there if you need it.

Or, phrased differently, they should make it harder to tweet longer messages.

[jfktrey]

Micropayments! /s

[alex7o]

That is exactly my thought. Actually it was microtransactions.