CNNMoney: Twitter is the latest company to get hit with a gender discrimination suit. Tina Huang, a former software engineer at the tech firm, filed a proposed class action lawsuit against the company for not promoting female engineers, like herself, to leadership positions. This comes on the heels of two other high-profile lawsuits: one filed by interim Reddit CEO Ellen Pao against former employer Kleiner Perkins (currently on trial) and one filed against Facebook last week.