Is there a website where I can write anything?

Yes. Start a blog.

you could also try not being a troll!

there are a lot of web 2.0 websites where you can write anything you want. Some of those are blogger, wordpress,, tumblr, etc., You can also make it public or keep it all private. Just stop the search engines from crawling your site for utmost privacy.

You may use any social media or networking sites.

Start a blog

Yes you can write on MEDIUM. Search for it. Its a really good website for both writers as well as readers. You will find amazing blog there for almost all categories. You can showcase your own writing skills there. Its amazing!!!

yes, there are various websites. just try blogging sites.