If you haven't got it, I use Lightshot to take and upload screenshots.
It allows you to do some trivial edditing like crop, text etc. (basic MS paint stuff) as well as upload it to the web in a really streamlined way. All you do is:
press printscreen > drag box over what you want (and draw/type over it if you want) > press upload (gives you a button to copy link straight to your clipboard)
it's by far my favourite way of sharing stuff like this.