Stage 2: The introduction
Here's the first of many chances to risk coming across like a friendly person, also known as a weirdo. There are many shades of introduction, but these days it's nearly impossible to meet a new person without an endorsement from a mutual friend.
The sad truth is that strangers almost always want something from you. The primary three motives are money for the bus, your eternal soul, or sex stuff, so any uninvited contact is met with justifiable skepticism.
Another barrier to unprovoked introduction are handheld 4G loneliness shields. It's easy to look like a loser when you're alone in public, so thankfully smart phones function as cocoons to isolate you from being bothered by weirdos. It's where all your Real Friends are hanging out, who just so happen to be Instagram models and New York Times writers.