Posting a selfie and getting likes makes you feel good but that feeling is only temporary. Afterwards, are you happier? The high quickly disappears and leaves you wanting more. You have to keep doing it to get the high.
That's your ego and that high will never make you HAPPY. Happiness is constant it does not elude you. The garden is your mind, plant your happy thoughts/seeds, water the seed with thoughts of how much you like yourslef daily and watch it bloom.
The best selfie is the one you didn't plan on. Making a stranger smile because you were kind. That person remembers your smile, will never forget your face because your soul spoke louder.