Have you ever read an article on a website that you enjoyed so much, you wanted to share it with all your Twitter followers? So you click the ever-present Tweet button and a window pops up with the title and link to the post set up for you. But sometimes, there's also a Twitter handle included. It's usually something like, "via @SocialMediaHats." That's something that the site owners set up to encourage tweets to include a mention of the article's author.
The problem is, those Twitter handle mentions are programmed site-wide. What happens when you have a publishing site with multiple authors? Typically, my own included, the ention is of the _site_ and not necessarily the article author.
For instance, Huffington Post, which accepts contributions from many different bloggers and authors, mentions their own Twitter handle, as opposed to the author's, on all posts. Here's a guest post from Jessica Ann, and you can see from the share that she isn't credited: