I just read this information in libertyreserve.com:

Dear Friends,

We have moved the survey to Tuesday, August 18th, as all surveys will be published only on weekdays. As always, the survey will have 10 lucky winners of $100.00 each. Surveys will be published every month because it tremendously helps us to evaluate our customer reach and system performance in whole. We would like to tank everyone who participates.

Good luck!