In #TheHashtag, Busi Lethole, CNBC Africa’s social media correspondent, takes a look at Bosasa CEO Gavin Watson’s fatal car crash, Tennis stars Serena Williams and Maria Sharapova will face off in the first round at the U.S Open, Springboks announce the team’s Rugby World Cup squad led by Siya Kolisi, and global backlash against Brazil over Amazon Rainforest fires….