Janet has a good point, and Dan Krokos (see Monday's comments) makes a great analogy: mentioning your favorite agent on the Internet is like "saying Tom is your favorite brother, then asking your other brother, Jim, to help you build a deck." At best, you're not doing yourself any favors, and at worst, you might be putting off an agent who would otherwise want to work with you.
So: if I made anyone uncomfortable, I apologize, and certainly feel free to remove your comment if you think that's appropriate.
However! I also believe that these opinions are very much rooted in individual dispositions and personalities, so while it may be best to keep these kinds of discussions off the Internet, you should keep in mind that not every agent (or every author) will respond to these kinds of things in the same way: some agents will care, and others won't. Some are much more involved in their clients' digital lives (and, of course, some authors have much richer digital lives) than others, and so I think that there are at least as many different electronic opinions and personalities as there are real-life opinions and personalities. Sometimes more!
I suppose my questions are, mes auteurs: what do we allow on the Internet, and what don't we? Are our collective attitudes changing as the number of folks who grew up on the Internet increases and the number who didn't decreases? Will the definition of "TMI," especially as pertains to the Internet, change substantially over the next several years? What role will social networking services like Facebook and Twitter—which probably already provide more information about people we thought we knew (or don't know at all) than we could ever want (or need)—play in this transition?
To the comments! Or, you know, not!