This is an intriguing idea, but I see two fundamental problems:
1) Isolation through cliques can be a bit of a double-edged sword. While the prospect of being able to battle spam (and a wave of unsolicited mentions) is probably immensely appealing to the 1%, altering the fundamental contract on which the protocol is based is almost always a bad idea.
2) Even if this accounts for a non-trivial fraction of overall revenue, they aren't going to stop pursuing advertising dollars. Which means that they still need to own the stream. And that the third party client massacre will, therefore, continue unabated.
1) Isolation through cliques can be a bit of a double-edged sword. While the prospect of being able to battle spam (and a wave of unsolicited mentions) is probably immensely appealing to the 1%, altering the fundamental contract on which the protocol is based is almost always a bad idea.
2) Even if this accounts for a non-trivial fraction of overall revenue, they aren't going to stop pursuing advertising dollars. Which means that they still need to own the stream. And that the third party client massacre will, therefore, continue unabated.