A few months back, I came across a quite interesting tool named ScribeFire. This add-on for Firefox browser is a blog editor. You don't need to login to your blog website to post contents, just type the contents using ScribeFire and click "Publish". I have even posted contents using ScribeFire in my blog.
I am using the wordpress blog So it works great! It also works with Twitter, and it has few more interesting features. Check it here
It depends on the user who is using it. If the user wants to copy paste, then no one can stop him from doing so. ScribeFire has advantage in posting one line posts. Suppose you are using Twitter, in order to post a content, you need not login to Twitter. You can very well use this addon to publish your content faster.