I just read this blog entry by Ted Kosmatka and my imagination spurred on how Google Alerts has changed the Internet. It is very possible to summon anyone, especially authors, simply by including their name in a blog entry. Google will do the rest. (There's no guarantee that they'll respond though.) Come to think of it, that's how I managed to score interviews with some authors... (I summon thee, J. M. McDermott! Oh wise John Grant, heed my call.)
And then the idea progressed further at how this can be used for spying applications. Secret codewords such as "Prestantra" might be included in a seemingly-random blog entry only to be picked up by a spy network somewhere, using ciphers to decode the actual contents of the blog.