WASHINGTON, May 12 : U.S. legislation that would require social media companies to take more responsibility for how their apps affect children and teens overcame a key hurdle on Tuesday, when a leading Republican senator said he would back the bill. U.S. Senator Ted Cruz said at an event in Washington on Tuesday that he will back the Kids Online Safety Act, a bill that would require social media companies to "exercise reasonable care" when designing features that contribute to harms to minors,