I find this logic flawed. The problem Peter has is that not 100% of his friends are on Twitter, so he is not getting the response rate he does from Facebook.
It does not matter if 95% of your Twitter followers are not real friends, as long as the 5% that are choose to engage, they will see your posts and be able to respond just like facebook.
There is more 'noise' on twitter, but only people choosing to listen to it, are affected by it.
