제 목    dqfMnkzilynUbPbRh 이 름    Shayne 날 짜    2018/06/28 조 회    1 A book of First Class stamps superloseweight.com Yahoo is trying to play catch-up to Facebook Inc, Twitter Inc and Google Inc in the fast-growing mobile advertising business, as consumers increasingly access the Web on smartphones instead of PCs, and flock to social media websites that require novel ad formats.