Not every conversation happens online. A phrase you won't find on Twitter or Technorati is The 250 — pronounced "two-fifty" — a cruelly sarcastic euphemism used in real-life conversations for the small, cliquey group of self-appointed Web 2.0 insiders who seem to spend their days blogging and Twittering about one another. The gist is that The 250 are the 250 people who matter to The 250. None of the other 6 billion people on Earth care which of The 250 are dating each other or got onto a panel at South By Southwest. I'm loathe to name names other than Valleywag editor Owen Thomas, whose site the other 249 check obsessively for mentions of themselves.