This article is a great jumping off point when talking about persona. A social media profile is the very personification of the concept of "persona." Tell your students to examine recent tweets from presidential candidates (maybe without showing which candidate has tweeted!) - what are the differences between the two persona's? Look at some celebrities, authors, and other common figures - what does each their social media say about their personality? Ask your students to think how characters in recent novels would portray themselves on their social media accounts. How does that persona differ from their personality?
The New York Times