I always write articles about 500 words and I add two or three pictures to make it look good. That way it won’t be deleted just like that (because it might look like spam) and if people actually read it and go to your website from there it looks ok.
Just like with every other high quality backlink strategy I’ve been writing about the last couple of weeks it’s the same with this one, DON’T EVER USE DUPLICATE CONTENT! If you do it won’t be a high quality backlink anymore it will become a dangerous, spam link. Remember, getting backlinks the easy way is never high quality, in fact it can be dangerous. Especially after Google Panda and Penguin updates!
Here’s the list of website you can use to upload your unique articles in Word, PDF or PowerPoint: