Although advertising is becoming more and more common on social networking sites that offer free registration to users in a bid to generate income, it remains to be seen if this move will be successful as critics argue that advertisers may be reluctant to promote their brands next to impulsive, and potentially offensive, user-generated content. Furthermore, it is not clear what the reaction of consumers will be as a result of this development, however, Twitter appears ready to make necessary adjustments depending on user-reaction by categorically stating that this latest move is still subject to change.