Body lanugae and "Mirroring" someone when interested?

Question

You know how they say you can tell if someone from the opposite s*x is interested by body language that mirrors your own? Well, what about smiles. If the person you have an interest in, always smiles back the exact same type of smile as you (when you smile at them first), is that a sign of interest possibly? Like a smirk smile, a big smile and half smile, etc.? (This guy always does the same smile back.)

Answer 1

Body language can be used to determine someone's interest in you but mirroring comes at the end of getting comfortable around each other.  It is the last stage.  

This is the entire sequence. Let's say you notice someone in a coffee shop. He notices you and makes eye contact. You smile, then he smiles.  One of you approaches the other and one of you will vocalize.  As long as it isn't rude, what you say isn't particularly important and it can be as simple as "Hi."   As you continue to talk, you begin to turn towards each other.  A touch will happen.  A touch on the forearm, the shoulder, the hand as a piece of muffin is shared but only for a second and then the touch must be withdrawn.  The touch must be received well and soon reciprocated with another brief touch.  As you talk, touching will become more common.  At this point you will start looking at each other with more interest and eyes start to wander a little to hair, shoulders, ears, hands torso etc. (Guys only.  Be Careful how far south you go.  Some gazing isn't well received.)  As time goes by the gazing becomes more intense until you can't take your eyes off of each other and it's intense eye to eye contact. This is where the mirroring begins and if you make it this far, it can go on for hours as long as your schedules don't get in the way and it's liable to make you miss an appointment.  

If you get the sequence down pat, you can move things along by recognizing the current step and and then moving to the next step in the sequence.

Answer 2

I think yes. But probably more important is touch. If he finds little reasons to touch you he is interested. Like when you both laugh about something and he puts his hand on your shoulder or if he opens the door for you and guides you with his hand on your lower back.