Here's a list of things I've done to grow my following to 10,000 Likes in two and a half years:
Always be mindful of the fact that you are serving your audience. Your job is to offer great value, all of the time. Allow your audience to get to know you, engage with them and they will get to know, like and trust you. Once they do that, they will buy from you.
Question: What has worked for growing your Facebook audience?