College recruitment: Google hires a large number of PhDs on the premise that they enjoy exploring areas that no one else has explored. To accomplish this, they have developed a network of direct relationship with over 350 professors at major schools. In addition, Google has an outstanding internship program that has a very high conversation rate to permanent hires.
Recruiter training: Google is one of only a handful of companies that requires most newly hired recruiters to go through extensive recruiter training prior to starting.