Here is a fun link building graph.
The main takeaway from this graph is that you only get value (in the form of links) when you give it (in the form of quality content).
Have fun!
P.S.: Click on the graph to get a better view.
Link building can be quite complicated, putting the information in a visual format is an excellent way to see where links are available. Here's another link building infographic I thought I'd share: http://bit.ly/linktoberfest
Cheers to you!