Legitimate Photo

There is a difference between people who take/post lots of selfies, and people who take/post photos of/with friends.

I am trying to consider the following reasons
1) people who take/post selfies
    a) only think that they are the best, and want to share themselves with the world, or
    b) are trying to get affirmations from others
    c) don't dare to ask others to take photos with them
    d) don't dare to ask others for permission to post the photos up
    e) Want to show themselves and others that they are present in the current reality. (存在感）
    f) for no reason :6


2) people who take/post/ photos with/of friends
    a) don't think they are important enough to take up just one photo for themselves
    b) to show/remind themselves or others they have friends, that they are popular
    c) to show/remind themselves or others that they are not alone
    d) for no reason :8

I guess all the above reasons are kinda legitimate, and there should be a lot more other reasons.