I think it could be beneficial to allow users to have a custom message per social channel when using the Publicize feature. For example, users could add hastags for Twitter but a more professional message for LinkedIn to adopt different tones and tools for each channel.
Something like: http://i.imgur.com/I18NmpN.png
I've written my idea here if you are interested: http://daniel-reed.eu/blog/2013/12/wordpress-idea-custom-publicize-messages/
Be great to hear your thoughts!