You'll also see a Tweet button so you can share your quiz results with all of your friends on Twitter.
For a basic tweet scheduler, try AutoTweeter.
Many Twitterers (or tweeple, as users are sometimes called) stick to the original social networking goal for the site, which is to answer the tag line question each time they tweet.
The application has become integrated into Twitter, for example, allowing people to spread the link to their "Elf Yourself" video thru a single tweet that can go out and get passed along to all their friends.
Similarly to Google Trends, they give a glimpse into what people are interested in currently, and in general one particular person has not much to gain if they also tweet about a trending topic.