I asked my 399 followers to find me a 400th and I would send that person a custom made button. I’m not much of an artist, but it’s a small way of saying thank you for caring about what I have to say. Gary Vaynerchuk talked about this in his SXSW keynote: the fact that anyone cares about what you have to say is enough to warrant a thank you.
What have you done to thank your followers/readers? If nothing, what are you going to do?