Think about 15 years ago. You would have to call the reporters, and there was an enormous wall to get through.
With the emergence of email, that wall dramatically lowered, but writers were still barraged with email so the likelihood of standing out without a prior connection was slim.
Now that Twitter has grown up, anybody can get access to just about any tastemaker (if you think you're a tastemaker, but not yet on Twitter, then you're not a tastemaker).
I use Twitter to establish a rapport. It is the greatest mechanism we have ever had to do just that.
-Adam