Surveys typically come more frequently on Crowdology than other sites, but that can vary from person to person.
https://www.ww2.site/forum/viewtopic.php?t=40952
http://178.210.82.182/forum/learning/52762...-bez-registrace
http://forum.spolokmedikovke.sk/viewtopic....3&t=1080692
http://forum.bandingklub.cz/viewtopic.php?f=50&t=1733493
https://debate.socialism.nl/forum/showthread.php?tid=317694
http://horsecity.ru/phpBB3/viewtopic.php?f=16&t=184380
https://www.ww2.site/forum/viewtopic.php?t=215162
https://debate.socialism.nl/forum/showthread.php?tid=233708
https://debate.socialism.nl/forum/showthread.php?tid=144563
http://gwenael.free.fr/diss3/viewtopic.php?f=2&t=10733
http://users.atw.hu/tunedthings/viewtopic....p=328129#328129
http://forum3.bandingklub.cz/viewtopic.php...4&t=1447141
http://forum3.bandingklub.cz/viewtopic.php...5&t=1358735