I used to tweet, but it's an act of futility. You're not really making any impact, and if you find yourself in a mood when you wanna be a bit controversial and you post something, you suddenly realise, 'Oh my God!' because you've opened yourself up to a bunch of criticism from strangers.
Social media is changing the way we communicate and the way we are perceived, both positively and negatively. Every time you post a photo, or update your status, you are contributing to your own digital footprint and personal brand.