i use it to keep in touch with family and friends i dont see. i dont really post updates on my own as i have no need to share what i do every day, or to give the internet my life story only to be used to hack my accounts elseware.

It's all about portraying yourself socially to other people.
And it helps to make us think that everything is about us.
We make these statuses and then hope as many people will 'like' them. Its very narcissistic.

but it's not interacting with people in the traditional sense. talking to a chat icon,just isn't the same as talking to someone face to face. It just is'nt. All social media has done is take the social out of everything. Even that no longer requires any effort anymore. 

The point of facebook is only to find out about Celebrity deaths.

It's to fill the narcissistic side of people, that's why people keep posting dumb as shit like picture of what they ate for diner or who their fucking, we are living in this ''look at me look at me!!!!'' time period everyone wants to be a celebrity like kim kardashian (being celeb for being popular no talent involved)

To have things sold to you.

No, I don't really know, I don't even have facebook. Personally I think it differs from person to person, some find it very useful especially for keeping in touch with distant friends, others just use it as their portal to see what's going on in the world in the same way that other people read newspapers or magazines or watch the news on TV

If it's stopped being useful to you, don't worry about leaving, fundamentally it is much less important than some people seem to think

I'm in constant communication with all of my friends, despite sometimes not seeing some of them for weeks at a time. I'm in contact with old friends and family members that live so far away I would realistically never see or talk to them. I'm constantly in a discussion or collaborating on a project with my fellow filmmakers or keeping up on what my extended family is up to.

There are a lot of reasons social media is awesome. It can go too far, and it's all about how you use it, but saying that it has no point just because there's a lot of garbage on it is throwing the baby out with the bathwater. Sometimes I become obsessive and spend too much time on Facebook, but as a tool it's invaluable.

I dont call for social media

Let me ask you a question. Why,can't you just use a phone for all of that? 

That's simple, people don't have the time for interactive 1 on 1 conversation anymore. It all started with the answering machine, leave a message, I'll leave a message for you.

Social media allows you to keep in touch with people without ever having to talk directly to them. Yup it takes the social out of interaction in that sense. That's where all the other nonsense on facebook comes in, people still have a need for small talk, rumors, gossip and acknowledgement.  The stuff you all did when visiting or meeting people in the street before smart phones and internet.
The same reason why people like party chat, no need to actually visit with people, still the benefit of mindless chatter.