Playing together is easier than ever in Guild Wars 2. There's no competition for loot or experience, so other players aren't going to stand between you and your goals.
Whether they're helping you beat an event, working with you to unlock challenging content, or facing off against you in Player vs. Player, other players should always represent an exciting opportunity.
You can always find new friends to play with using the Looking for Group tool—or by running into them in the open world.