On social media sites, people tend to post only positive updates (8)that make them appear happy and friendly.But smiling photos can hide real problems.Remember the saying：on the Internet, nobody knows you’re a dog.A young person could be old; a woman could be a man; we could even be sharing our information with criminals. But this doesn’t mean that we should throw the baby out with the bathwater.(9)Although technology has changed the way we acquire friends, the meaning of friendship and our longing for friends remain the same.(10)As Aristotle said, no one would choose to live without friends，even if he had all other goods.