Not exactly. Twitter doesn't want you to build anything that will take a single eyeball from them. There are still services that can be built that don't fall in

Not exactly. Twitter doesn't want you to build anything that will take a single eyeball from them. There are still services that can be built that don't fall in that category, though, such as sentiment analysis. At least, for now. Twitter has shown they are willing to be hostile towards their developers. Even if I fit in the "don't take their eyeballs" category, I wouldn't build on their platform because I don't trust them.