Honestly, the best way to maximize the reach is to put things on the webpage that people see and want to share. In my newsfeed, every day, I have a ton of photographs and a handful of articles that people have found and thought were sufficiently amazing that their friends should see them. High quality content goes viral, but if your content is no different from anyone else's, it won't spread very hard, even if you pay for "likes". I have now reached the point where I won't even go LOOK at a page that is running a contest ("Like this and you're entered to win a . . . ") or any page that appears to be angling for posts or likes (like the shocking photos, or the ones that say, "Give this a caption."). I go look at things that make me want to look at them, and there are actually a lot of those.