Good friends are one of the most important parts of our daily life. As Warren Buffett once said, it takes twenty years to build a friendship and just five minutes to ruin it.
Be honest. Can you really trust all of your friends? We all tend to hang to the romantic idea that all friends are what we hope for, assume and they always supposed to be: genuinely trustworthy.  
Life is simple, we just made it complicated. Nothing defines the relationship difficulties better than friendships. Show me your friends, and I going to tell  you who you are.
We automatically assume that our friends like us for “what and who we are” and because we love them. Sometimes, this might be very true. The motivations of how, when and why to choose a friend are manifold.
While we thank God, we still have friends who love us for what and who we are, many of them have a selfish motivation to connect with us. Very often they expect benefits or advantages. It can be advantageous to befriend with wealthy people who may own a yacht, a hotel, and a nice vacation home or throw elaborate parties with famous people.
Often, it's primarily all about the purpose, not necessarily the friendship. Some friends may assume sex, other financial rewards, social status, vacation companionship, or other egotistical advantages. They are using each other just to fulfill a purpose – whatever this may be.
Yes, this is social fraud.