I've tested Patrick's scalable content practices and have had much higher return compared to both AdWords and Facebook advertisements. Best part is you spend the time/money up front and it keeps working forever.

FWIW - In comparing these three methods (Content, AdWords, Facebook) based on their impact on the bottom line ($$$ -> that's what counts, right?) Facebook by far was the worst performer.

The only drawback to this is that it takes patience - results are not immediate.