You may use Twitter or other social networking sites and blogs to keep track of your friends and family, but these 13 weight-loss winners are using personal Twitter and blog accounts to stick to their diets. Among them, Jennette Fulda, pictured above, lost 180 pounds (and wrote a memoir about her success).

So what does Twitter offer to the struggling or advanced dieter or fitness lover? People are using it to track their calories, their weight-loss, their exercise routines and to swap diet reviews, leaner recipes, fitness tips -- and to give each other a morale boost after a slip-up or after a week of no cheating. Click through AOL Health's photo gallery of top Twitter-dieters' before and after photos and their best weight-loss advice (in tweet form, of course).

Plus, follow AOL Health and That's Fit on Twitter.

What about you -- do you have a diet blog or use your Twitter account to track your progress?