We all know that internet its a very useful tool in terms of communication, homework, investigations and entertainment but we also know that we must be very careful with the information that we post because we don't know who is the person that is reading it and how will she/he use it. In my opinion, the amount of information that we post must depend in the website that you are using. the most public the website is, the most risk that you take. Also, when you are taking all the safety ways while you are using the net, you need to be careful to don't enter in suspicious links that take your important information and you don't even notice that. So, I thing that is very dangerous to give personal information in social medias.
If i have to choose a favorite social media I will say that Instagram and Whatsapp are the ones. The first one because there you can chat with your friends, watch funny videos and pictures and upload your own ones to share funny or especial moments with yours followers. And the second one its only because its an easy and private fast way to communicate with someone that could be anywhere worldwide.
I never post personal information, like my address or my phone number in public websites because i don't have control of who's looking it and I only give that information to my family or friends in "privates" conversations. I don't use my real name in all the websites that I visit, for example, I only use it in webs like Facebook and Instagram to make easier to my friend to find me, but when I play games online or use others websites that I don't use frequently I always change my name and age. Call me paranoiac or something similar, but i really take cares in this situations.