Older people tend to write longer Facebook statuses

"Younger people express more negative emotions (including anger) and swear more. They use more pronouns referring to oneself (“I”, “my”, etc.) and talk more about school. Older people write longer updates, use more prepositions and articles, and talk more about other people, including their family.
Word usage of more “popular” people also differs from people with a lower friend count. People with more friends tend to use more of the pronoun “you” and other second person pronouns. They write longer updates, and use more words referring to music and sports. More "popular" people also talk less about their families, are less emotional overall, use fewer past tense and present tense verbs and words related to time."

Source:  Analysis from Facebook's Data Team, 23rd December 2010

(Lots more analysis shown)