More than 50,000 runners from across the world are participating in the 2015 TCS New York City Marathon on Nov. 1. Many participants and their supporters turned to social media to post photos and express their emotions ahead of and during the event. The above mosaic shows social posts from people along and near the race course. Are you there tweeting? Use the 'Find Yourself' tool to find your post or click to see posts by others that mention popular marathon hashtags.