A Dutch blog (geenstijl.nl) has used this to organise a initiative to count the votes for the 2014 European parlement elections, because the results only were to be announced days later. They had 1378 people sending in the results they got by waiting for the results in polling stations. And with those results they were able to make a very accurate exit poll.

https://en.wikipedia.org/wiki/GeenPeil#First_initiative_2014