I don't know
UPDATE: tweets and blogs are served when companies or people or entities want to convey a transparent message. Meaning such and such bug was repaired or warning this could happen to you or somesuch. Where blogging and tweeting fail is when it's used by marketers to elicit some sort of purchase or transaction. While advertising is a legitimate use it is clearly not with the Internet was intended for; it was intended for the purpose of sharing information. One might attempt to justify advertising and marketing as necessary in order to increase bandwidth at disproportionate lower costs. However that has yet to be proven considering most up-and-coming countries who are deploying fresh infrastructure function at higher capacities with lower costs.