An opinion I'm hearing a lot lately is that Twitter, the fun social-networking toy that crunches everything down to 140 characters, is somehow going to supplant not only existing forms of news media, but a significant amount of the work done by in-house media and PR departments. Here's the sum total of what I have to say about this: really? Really?? You really think that? Really? Really really? That's really your real opinion? REALLY?