None of the choices fit my category:
I occasionally follow you (as evidenced by my late contribution) on an RSS feeder (Google Reader, to be precise).
I read "Whatever" to find out more about your other writing, specifically your books. I first encountered your work through coming across "Old Man's War" at a Barnes and Noble. I bought it and basically consumed it in one day. Great stuff- some of the best new SF I'd read in years. From there, I went after anything else you'd written.
Not that you've asked, but I wish you'd do more short fiction set in the Old Man's universe, as you did with the story about Harry and his little diplomatic demonstration fight.
I missed twitter in the second choice, so I clicked the first, but I also follow your twitter (which you don't seem to use as much)
RSS, Twitter and the AMC sci-fi blog.
Google reader and Buzz. I'm into the Google Borg.
Google reader to follow Whatever. Used to follow @scalzi in Reader as well, but everything I'm interested in shows up on the blog eventually, so I cut down on the noise a bit and stick to just the blog.
RSS and Twitter (@scalzi, not @blogwhatever).
Follow you on greader & twitte. Oh and buy your books, does that count for anything>
Does stealthily following you down the street count?
I follow the RSS feed on LJ.
Whatever via Google Reader
plus SFWA stuff
I read Whatever, mostly in the RSS feeder, plus following you Twitter and Facebook.
You won my heart with the creation museum tour, and I've been reading Whatever ever since. And even though I'm usually a non-fiction science reader, I've read some of your books, too. :)
I follow you on LiveJournal. That's still the same content as Wahtever, reposted, but that made me click on your last option.
I follow you on Whatever through the RSS feed to LJ and on Facebook. You don't post on your Goodreads account or I would be following you there, too. I even follow the link back to Whatever to post a comment now and then.
I use Google Reader to read a multitude of RSS feeds, but yours is one of the few I read regularly.
Read everything through Google Reader and have only visited the site a handful of times.
I regularly follow you thru RSS in LJ and on twitter - and yes, you're still hilarious on twitter ;>
I read you mostly via Google Reader
Online I read your blog and your tweets. Offline I read your books.
I read you on Whatever, on Facebook and twitter. I must admit I became a fan of Whatever first then you're sci fi writing. Great meeting you briefly at Worldcon last year too.