Toluna
It is a page that is dedicated to pay for the surveys that offer you, is managed by a points system, which you can get:
1. Answering surveys.
2. Voting in the sponsored contents.
3. Making original content.
4. Participating in the competitions.
When you reach 50000 points, you can access the prize area and redeem them for money, cards from recognized online stores.
Surveys range from 1000 points to 15,000 points, and offer you extra points to complete your profile.
To give you an idea in just 2 days you can get 25000 points which is equivalent to 8 USD.
One of the best polling sites, very dynamic, seems like a social network to exchange opinions.