According to the FAQ: "We like the little aliens." This seems well targeted to appeal to the Stack Overflow / Server Fault / Super User audience, but way off the mark if the goal is to "make the Internet a better place to get expert answers to your questions."
There are experts who aren't interested in or focused on technology oriented topics. Little aliens are unlikely to be something that someone interested in organizing a site on gardening would gravitate too. No, I'm not suggesting that no one interested in gardening would be bother to look at a site with little aliens, but won't it be likely that the sort of mass appeal to to a very broad cross section of the internet will be lacking?