Small talk is a useful way to find out what interest we share with the other person. It serves other purposes as well.
It provides a way to "audition" the other person-to help us decide whether a relationship is worth pursuing. Small talk is a safe way to into a relationship.
Finally, small talk does provide some kind of link to others; it's often better than being alone. The topic of this paragraph is
(a) Auditioning Others
(b) Small Talk
(c) Relationships
(d) Conversations
The best statement of the main idea is
(a) Small talk is a safe way to into a relationship.
(b) Very few people enjoy being alone.
(c) Small talk serves a number of purpose.
(d) Small talk is often considered unimportant.