While this is a sad day for Yahoo - as big as Facebook and Google in its prime - it raises interesting questions about its new owner. What are Verizon's ambitions? Beyond the talk of becoming a global media company, Verizon chief executive Lowell McAdams wants a larger share of the booming digital advertising pie. And he thinks this deal will help him. As a leading US mobile phone network, Verizon already had a wealth of data from smartphone users that it could mine. Its purchase of AOL a year ago for its programmatic advertising technology allowed it to leverage that more effectively. Yahoo, meanwhile, has struggled to build its mobile advertising business. Its appeal is that it has content....