Have you ever wanted to post something about a favorite restaurant or shop in one of those city guides where users contribute content, but you're too busy to sit and write out a detailed review? Meet PlaceShout, a site for snappy user reviews that's perfect for our attention deficit culture. Organized by city, you can contribute your own two cents (in this case, exactly 100 characters, no more) about your favorite restaurant, club, park, shop, farmer's market, whatever, as well as look up places that you think might have been mentioned by someone else. If you agree with the contributer's comments ("best fried chicken in the world," for instance), you can click "agree" under that item in Digg-like fashion.

I'm not a big user of Twitter (I don't know why anyone would care what I'm doing right now), but I can seeing logging into PlaceShout on my iPhone when I find a great restaurant or shop I want to share. What I'd like to see is Twitter crossed with PlaceShout so you can get updates from your network of friends when they're in interesting, fun places.