Tumblr is making you suck and you're making Tumblr suck, so basically you cancel each other out

This afternoon I was in my IT class (Information Technology also know as ICT also know as Information Computer Technology), and two girls were on Tumblr.
Which isn't on topic, at all.
The thing is these two girls were obsessed with looking a pictures of girls partying, making out with boys, their clothes and best of all giving the camera the finger.
And all these photos are of girls over 16, and they have really High Definition cameras.
And I suspect these girls in my class want to be like these "Tumblr Girls". The reason is probably because it's the closest thing you're ever going to get to being a model.
And I noticed that most of these "Tumblr Girls" account names were usually dis-selfrespecting stuff like "NerdWhore", "PartyWhore" and just awful stuff! And then other names that sound really sweet and innocent like "Honeybeeezz", "Flowergirl" and just things you'd think these names belong in a childrens show.
Usually these pictures are of girls in Bikinis, Mini shorts and really short dresses.
It seems as though these girls don't realize these pictures can be "reblogged", copy and pasted, downloaded and commented on. And worst of all they stay on the internet forever 
They don't go away. Someone would've "reblogged" them, someone would've copy and pasted them. So deleting the orginial picture is no use.

Even though it seems fine now, these pictures could turn on you in later life. You couldget turned down jobs, get jobs only to find out the employer only wanted you for what he saw on the internet of you, blackmail and bullying.

And I'm not saying the Tumblr is all around bad, because there are some pretty cool people on there, like my uncle (Shout out to The Bookmark!)
But come on guys, get online wise.

Just a few examples of what I'm talking about: