Friendships;

Similarity
People like people whom they perceive as being similar to themselves. You and your best friend have things in common. These things may include attitudes, beliefs, hobbies, goals, and dreams. More likely than not, you like to do the same things. Furthermore, you and your best friend probably have similar dislikes as well.
The similarity principle can be used to enhance our interpersonal relations and increase our own personal confidence. There is a distinction between true similarity and perceived similarity. True similarity is actually having something in common with someone, while perceived similarity is matching someone’s behaviors so that his or her subconscious mind perceives you as similar. Both kinds of similarity can help you improve your interpersonal relations.

Cooperation
The next ingredient that ensures people will like each other is cooperation. It is an absolute necessity. Without cooperation, there can be no basis for friendship. People who cooperate with you, participate in activities with you, and generally agree with you are undoubtedly more likable to you than people who do not. If someone you consider your friend decides to stop returning your phone calls, starts canceling appointments on you, or is generally uncooperative, it would obviously be difficult to maintain the friendship no matter how similar you are to the person.

Praise
Praise is the third factor in making one person like another. The importance of praise is obvious. People like to be praised, complimented, and recognized for their achievements. At work, employees often become disgruntled not because they are not compensated well monetarily, but instead because their hard work goes unrecognized. Just as praise unites people in harmony, put-downs and insults divide people. It is much harder to like someone who puts you down than someone who consistently praises you. If your best friend did nothing but insult you, it would quickly dissolve that friendship.


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All the above's from my brother's blog.
And it's true.

♥Bestfrs.