EDIT: I see it forces you to use your yahoo account which in effect would link it to my email. Also, it demands a mobile number and I don't have the text option. Between these two factors I'll have to decline.
As I said on another thread, I recommend Imgur. It's specifically designed for exactly this purpose - hosting photos to be posted on other websites - and it automatically generates the code that you need to paste into a Nitrateville post.
I used to use tinypic.com, which you don't even need to sign up to use, but I've found it no longer works properly for me (it won't let me cut and paste the code that it generates). You may have more luck with it.