You know those awesome YouTube videos all you crazy kids are watching these days that are so easy to add to your own website? How about when you embed something from your oh-so-awesome third-party, integrated, whatever? These are all contained in frames – just like a picture. Inside of the frame, it is its own entity. When you abuse frames, you aren’t putting any real words on the page. It’s similar to Flash or having content in images. Not only are you unable to take credit for someone else’s work, you gain nothing from it if that’s all that’s on the page!
If you’re going to embed things like YouTube videos on your website, make sure to put a bunch of content around it. Google likes to know what you’re doing with all that stuff, so just let ’em know!