Response Rates and Surveying Techniques: Tips to Enhance Survey Respondent Participation
http://s3.amazonaws.com/SurveyMonkeyFiles/Response_Rates.pdf

SurveyMonkey
2008

Abstract:

Sufficient response rates are important for surveys. A survey that collects very little data may not contain substantial information. In order to collect successful responses, researchers must take into consideration the audience, the quantity of online surveys in circulation, and the potential for surveys reported as spam. These factors may result in lower respondent interest and acceptance of survey invitations. But there are ways to increase response rates!