Friend clicks your pic, it doesn't come out that good. You go home, add every possible effect in that pic, and BOOM! You're size zero from size-12, your face is blemish-free, unnecessary stuff erased, and the male eye-balls are already in love with your pic. People who like to add effects to their photos are generally mysterious, self-absorbed, and would never want you to see their true self. Not to be taken in a negative sense, but they like to keep the enigma alive.