In mid-November, Twitter followed the likes of Facebook by going public with the most hotly anticipated stock debut of the year. As part of Twitter’s growth plan, it is focusing on how to attract and retain small businesses as a potentially lucrative source of advertising revenue. In 2012, Twitter rolled out a paid advertisement platform. However, it was only available to invited businesses. In the spring of 2013, Twitter announced it would make its ads available to all U.S. users.