I have a Facebook page with 30k fans. I post around once or twice a day on Tumblr and I manually copy and paste the links on the Facebook page. Normally i get 4,000-6,000 people who "saw this post" according to Facebook. Generally when I ask questions and type directly on the Facebook page, I get around 10,000 people who see the post. If I use Tumblr to autopost to Facebook, I get less views. What's the best way to drive traffic to a site from a Facebook Fan page?