NEW DELHI, April 18 -- Twitter has started taking down tweets of politicians like Uttar Pradesh chief minister Yogi Adityanath, union minister Giriraj Singh, Shiromani Akali Dal MLA Manjinder Singh Sirsa and Bharatiya Janata Party's IT cell head Amit Malviya, among others, as they violate the model code of conduct in force during the ongoing Lok Sabha elections....