The real social part of cycling (and most athletic activities) is the pre-ride and post-ride hangout. It's usually not the riding part. But on the ride itself,

The real social part of cycling (and most athletic activities) is the pre-ride and post-ride hangout. It's usually not the riding part. But on the ride itself, social rides usually involve being in very close proximity (handlebars only a few inches away from each other), and it's normal to strike up a conversation.