Samsung is a sponsor of the Mutua Madrid Open tennis tournament that begins this weekend. Ferrer intended to send out a tweet stating he was very happy with his #GalaxyS4 and that he was “configuring S Health on my new #GalaxyS4 to help with training @SamsungMobile.” He neglected to notice that the advertisement was being labeled as “via Twitter from iPhone” because he actually uses an iPhone. (via Samsung celebrity tweets out support for Galaxy S4 from his iPhone)