Why Do Ladies Ignore Their Male Friends On Social Networks?

I really can't fathom why a lady will ignore her male Friends on any of the social network.. They seem not to care when you are online.. But, they are quick to respond with the speed of light when you send your Pm..

Some will even ignore it for days and you knowing fully well that that the message was delivered and read.. Some of your messages will never be replied... Why do Ladies act so cold and paranoid on social networks..

My sister once told me that she ignores her boo sometimes knowing fully well that he is online... Lollxxx... My girlfriend also does same... but, she answers my pm without delay... If you don't pm them, they will ask whether you didn't notice them online..

A friend of mine once deleted his cousin sisters on account of these...

So ladies, why do you act the way you act on social networks... Or is there something we guys are not saying or doing right??.. .