How does one infiltrate a group of friends that is exclusive and does not welcome outsiders?
I can think of a few ways and would like you to add some...not sure if this is social engineering though.
Let us take drug users for example and the example of drug users would be the 420 crowd or stoners.
1. Convince them that you are one of them.
2. Become friends with a key figure in the group.
3. Make it clear that you have no interest in being their friend, be nice to them, but make them want your approval.
4. To have a friend you need to be a friend, have something to offer to the group or individuals in the group that will help you earn a reputation. People will later want to hang out with you.
5. Show them that you are very happy with the person that you are.
6. Get to know some of their names, greet those who you know the names of as often as possible