Charging for services



Does anyone know if broadcast services such as (e.g Hootsuite, SproutSocial, NeedTagger, Socedo) are in vioation of the Twitter API rules.
These companies charge a monthly subscription fee to allow users to post messages.

What is the difference between this and Flattr? From the Flattr blog post

“Your advertisements cannot resemble or reasonably be confused by users as a Tweet. For example, ads cannot have Tweet actions like follow, retweet, favorite, and reply. And you cannot sell or receive compensation for Tweet actions or the placement of Tweet actions on your Service.”