[bcj]

More likely, Alex does not want to spend the time to provide moderation for a comments section. His stance is that Twitter is bad because the kind of community it creates—it would be silly for him to create a comment section that similarly failed to meet his expectations.

It is perfectly fine for Alex to criticize Twitter without providing his own alternative (though he does tacitly recommend using IRC and Facebook instead). Alex is a Rackspace employee who also is heavily involved in the Python community. The expectations on him for providing a space to talk are completely different than a company who's business is providing a communications platform.