Sam and Chris are engaging in small talk, and looking for things they might have in common, a quest for similarities facilitated by social media. They are at which stage of a relationship?

Sam and Chris are at the Curiosity, Interest, and Infatuation stage of a relationship.

Explanation:

Sam and Chris are comfortable in each other's presence and are now looking for things they have common with each other to find shared interests and things that they like.

They have begun to share things with each other and are intuitive to what the other likes as well as willing to show what they like with the other person.

This means they have developed a genuine curiosity in each other's likes and dislikes and have an interest in sharing their own interests with the other person.