More than 2,000 middle and high school teachers took an online survey. Researchers also spoke with teachers in focus groups.

2000多所中学和高中的教师参加了网络调查，研究者还与重点小组的教师们谈了话。

youdao

Pew also conducted two online focus groups of teenagers ages 12-17 in June 2012.

CNN: Survey: Teens' enthusiasm for Facebook is waning

To decide which of the pilots it picks up, the company will be looking at several types of viewer feedback, including online surveys, offline focus groups and, perhaps most importantly, viewer behavior.

FORBES: Amazon Asks Users: Which Original Shows Should We Make?

It has created an online platform that allows companies to setup focus groups by leveraging collaborative technologies and databases of consumers.

FORBES: 4 Hot Online Ad Companies to Put on Your Watch List