Do you wonder why Venus Williams was wearing Miami Dolphins T-shirt in her press conference today at US Open? The Williams sisters have to be admired not only for their tennis skills but also for their business and entrepreneurial skills. Only about ten days ago it was reported that the sisters planed to become limited owners of NFL’s Miami Dolphins, and Venus has already been promoting the team at the U.S. Open. Serena also famously uses Twitter to promote her business ventures, let it be her upcoming book or her appearance on Home Shopping Network. Do you get bothered by Serena’s constant promotional tweets, or you love anything she tweets about?