I agree getting more content on twitter is an good option for montetization. It might even be the best one. I brought up Google because time spent on a site do

I agree getting more content on twitter is an good option for montetization. It might even be the best one. I brought up Google because time spent on a site doesn't necessarily mean a whole lot more ad revenue. What matters is serving up useful ads that provide value to the user and advertisers. Google is great at that - Twitter isn't because of many reasons you've stated. So maybe twitter should be trying to improve their ad program to serve better ads. If they can't do that well (no way they could do it as well as Google) then perhaps increasing time users spend on Twitter is their best option. I only wanted to point out that the solution is not self evident. Just because people are using a service to find content hosted elsewhere does not mean it can't make money. The problem might be that Twitter is bad at finding ads people want to see.