I have a 16 years old daughter, whenever she have free time she wastes it on things
that I think are futile like Facebook, Tumblr, etc
First off, I personally think you would find that in this day and age, that is not an uncommon occurance. I'm sure there are plenty of teenagers out there now that are hooked in FB, twitter and any social media site.
2nd. Whos to say those things are futile? Whos to say that in 3 years they could be the biggest thing out there (if they aren't already of course) and that knowledge in their industry is what you have to have to get anywhere in life. What about the contacts she might make though those sites might give her leads to great things in life.
Third. I honestly believe although you can guide your child in a positive and constructive direction, trying to force them down a route will only have the adverse effect. She has to wake up one day and realise that she wants to do something with her life and what that something is without realising she's been pushed in one direction in the other. Basically it has to be her decision for it to be a good decision for her.
4th. We are all different. Some of us don't like maths or the sciences. Some of us don't like the arts. And some of us don't like sports. Don't push her down what kind of ciriculum you like.
So to my point. I think this must be one of the hardest stages for a parent and potentially one of the biggest for a childs life. It can shape who they are to become as a person and the road their life can start down from. I think the best thing you can do is to listen and observe their behaviour. Find out what they are good at and more importantly what they are interested in outside of FB etc
Everyone will have something, some are just better at hiding it than others. Once you find that thing, slowly coax it and show interest. Try and coerce it into being a major focus in her life. Show interest in it, but not too much as it's her thing not yours.
And remember. What you consider worthwhile might not be worthwhile to her. And if that's not the case no amount of forcing or manipulating will do any good. She will move on from the FB and twitter phase. Be there for her when she does. She won't thank you, but she will know!
Now take a step back and think back to your 16year old years. Are you the same person you were then that you were at 21, that you are today? The core values are probably the same, but your interests are probably different. Her's will change too!
Lastly
I have a 16 years old daughter, whenever she have free time she wastes it on things
that I think are futile like Facebook, Tumblr, etc.
Just thank your lucky stars she is not on drugs, alcoholic or pregnant. Now that is defintely way too common in our young of today and something a parent should be truely concerned with!