1. In the past even five years, we've seen huge changes and experiments in business models (just saying that these have been tried at scale in the past 5 years)

1. In the past even five years, we've seen huge changes and experiments in business models (just saying that these have been tried at scale in the past 5 years). Some have been successful, others have not: In-app purchases (Zynga), SaaS (37 Signals), Freemium (DropBox), Daily Deals (Groupon), Early Advantage Buying (Pinboard), User's Choose (HumbleBundle), Razor/Blades (Nexus 7, PSP), $.99 (iTunes, Google Play) etc. I'm not arguing that free is always better than paid, just that in app.net's case, it probably is. 2. The core difference between "MySpace + Facebook" vs. "Twitter + App.Net" is that the reason (at least published) why App.Net is better is because it isn't supported by ads (& that the Twitter team is focused on how to sell ads diminishing the importance of the user). I don't believe that this is a strong enough reason to change my user behavior. 3. Subtle differences can be meaningful. Agreed. I guess who knows what will happen with app.net but I think the great biz model experiment will only accelerate in general.