I always wondered, what's up with girls kissing each other on lips and posting pictures online? is it like the best friends thing? does it get awkward only if the tongue gets involved?

It was disgusting enough to see parents kissing kids on the mouth (if you think otherwise, I don't care... I feel it is disgusting to kiss small kids (in few cases I've seen kids as old as 8-11 years) on the mouth) these people should be smacked on the back of the head for it...

this question triggered because a female friend posted a picture of pouting with a bride-to-be (she was getting married to a man, following pictures and sights made it clear) in bed.. why? just... why?