You know what I like best about Twitter?
It isn't the fact that it's easy to use and a big bag of fun (although those are important). It isn't the fact that I can communicate with some fantastic people, get answers to questions and pick up information and advice that I couldn't have learned any other way (although those are important too.) And it isn't even that it's a fantastic marketing tool that drives traffic, builds brands and increases sales (although that would be a good enough reason alone.)
Fill your blog or your website with pictures of your cat, your family or your vacation in Yosemite and you might please your readers, but Google won't know what to make of it. Unless you have a sizeable amount of text on your Web page, its robots won't be able to decide what you're talking about. You'll get Public Service Ads that don't earn you a dime instead of nice, profitable AdSense ads that give you big checks.
The AdSense Code: What Google Never Told You About Making Money with AdSense