Do you think you tweet at a fifth grade reading level? Chances are you don't. TIME's analyzed one million public tweets and found that 33 percent of them were written at at fourth grade reading level. Researchers used a reading comprehension survey to determine the complexity of the tweets, including some celebrity tweets. Justin Bieber and Lady Gaga were both found to tweet at the fifth grade level, while President Barack Obama was found to tweet at a seventh grade level.