Hello everybody, Hopefully you are all safe and sound. I need to conduct an online survey, which will be handed out through Facebook, Twitter, Instagram, and the website of a local online newspaper. My objective is to reach their audience as a whole, yet I am confused and lost about how to calculate the survey sample size having in consideration that: 1) There are fans from Facebook and followers in Instagram who are the same person (but of course I cannot match them to filter them out); 2) What number should I use as a population in order to calculate the sample size --i.e Facebook fans, Twitter followers, Instagram followers, web page visitors, or a sum of all of those, an average of all of those, should I calculate and therefore run one survey sample size for each platform/source? If you could give me any input/feedback on this I will be very glad. Thanks a lot. *Matt Erlandsen* *Estudiante Doctorado en Ciencias de la Comunicación* *PhD Student of Communication Sciences* Pontificia Universidad Católica de Chile +56 (9) 8218-5055 @matterlandsen <http://twitter.com/matterlandsen> Santiago, RM, Chile.- By not printing this email you've helped save paper, ink, and millions of trees. No imprimas este mensaje, así estarás ahorrando papel, tinta, y millones de árboles.