Short answer: Favorites are private and one-way; Friends are mutual and need approval.
- ⭐ Favorite: add to your private list — no request, no notification.
- 👥 Friend: send a request → they accept → both shown as friends.
- 🔄 Not both at once — remove one, then add the other.
💡 Tip: Use Favorites for quick access; use Friends for closer connections.