By Daren Butler and Ali Kucukgocmen ANKARA, July 29 (Reuters) - Turkey adopted a new social media law on Wednesday that critics say will create a "chilling effect" on dissenting voices who have resorted to Twitter and Leia Glass other online platforms as the government tightened its grip on mainstream media. The law was backed by President Tayyip Erdogan's AK Party and its nationalist allies to make...