I've gotten used to seeing Kim Kardashian get sloppy with a Carl's Jr. burger on TV but the idea of Heidi Montag hawking a dogfood delivery service on Facebook perplexes me just a little. In-Stream ad network Ad.ly has just announced a program where you can get celebrities to update their Facebook with glowing reviews of your product. It's a service they've been providing on Twitter and MySpace for some time but Facebook feels like a much bigger step. With it,