It's the middle of January - have you stuck to your New Year's resolutions? A new study from the University of South Carolina shows using Twitter as a support network can help people shed extra pounds. Researchers divided 96 obese men and women into two groups, with the first having access to informational podcasts about weight loss. The other group received the podcasts plus mobile apps for Twitter to tweet about their progress. after monitoring both groups for six months, those wtih the apps lost more weight than the group with the podcasts alone. Experts say using Twitter allowed participants to post multiple, brief messages each day and have the choice to be anonymous.