alt Hacker NewsI fit this description too. I consider myself an introvert (that is, more introverted than extroverted; very few people are exclusively one or the other) because I need to be alone to recharge. When my "social battery" is full, I eagerly start conversations with strangers, and even when it is drained I'm comfortable talking to people, though I might not desire to.
It all depends on the subject - I can talk about cooking, climate change, collapse, film for hours. As for sports, gossip, celebrities, I clam up. Ditto for any talk that's status seeking or not curious and bi-directional.