So, you have quite a following these days. As we know from Spiderman, and maybe Nietzsche before that, that carries a lot of responsibility as well. Is there something, in addition to buying your books, that you actually would want to ask from your followers?
A wise man named Strongbad once said, "It's better to use your powers for awesome than anything else." However, it is a worry to me that people will take my opinion too strongly. We have a culture, particularly in America, which overemphasizes the opinions of celebrities, myself included.
That said, I would encourage you, if there's one thing I could have people do, to support new writers, and to support good book sellers, and to encourage our entire genre, particularly through the new authors. It's much harder for them, these days, than it was for me when I was breaking in. So, support your bookstores, and also loan books that you like to your friends and have them read them, particularly if they're authors that not as many people are paying attention to.