This site offers surveys for money, paying out cash rather than points and allowing immediate rewards. Crowdology is a pretty popular website with a decent reputation which works with big brands and television shows, so can have some interesting content to keep you interested while you’re filling in forms. You could be answering questions about everyday topics or issues, such as saving money or online shopping, as well as your opinions about various products.
Illegitimate companies and scammers have a simple objective. They're after your information in order to get your money. It's much more common for internet scammers to target hundreds of people for small sums rather than a single person for thousands. This is because demanding large sums for a product that is somewhat unclear is an obvious red flag to most.
Select a representative sample: Selecting a representative sample from your sampling frame is also important for collecting valid and reliable data about the population of interest. For example, if you are sampling from a large database of customer email addresses and only wanted one response per household, you might want to cross-check each email address against mailing addresses and remove duplicates to avoid some households having a greater probability of selection. Then you would likely draw a random sample from the remaining list of email addresses.

Like American Consumer Opinion, Harris Poll Online offers cash incentives to people who are willing to log in regularly and complete online surveys and questionnaires. Once you join, you’ll begin earning rewards for each survey you take. Once you earn enough reward “points”, you can turn them in for purchases made on websites like Amazon, iTunes, Home Depot and Walmart. Conversely, you can also turn in your points for movies, books, and home goods ordered straight from the Harris Poll website. Plus, you’ll be entered into a $10,000 sweepstakes each time you complete a survey.
The cost of living has continued to rise, while the average salary is still somewhat stagnant when compared to a decade ago, and this is why so many Americans have started to look for ways to earn money at home without having to invest too much time or effort. Family and friends come first, but with paid online surveys, you will not have to cut out any portion of your routine to earn extra money online, as you can instead go through the processes in your sparest of spare time. 
One example would be that a brand like Coke or Pepsi wants to know more about what kind of people are buying their beverages. They might want to learn more about the age, gender, income, or location of the people who like or dislike their products. They might use this for marketing purposes or to make decisions about their future products. Brands like this spend a lot of time and money investing market research to get your feedback. You just get money for doing them a favor – it’s a total win-win!
To save time and money, many companies are turning to online market research. Surveys, in particular, can easily be conducted online or over e-mail. The cost of a 200-person, e-mail survey is $2,500 to $5,000. To get the same number of responses from a snail mail survey would cost between $5,000 and $7,000, and phone surveys can run as high as $15,000 [source; Yahoo! Small Business].
While surveys vary widely in how they are conducted and used, there are a number of components that are common across nearly all surveys. Many of these common features have been studied in extensive detail by survey methodologists, psychologists, statisticians, and many other fields of research. The general process of survey research is outlined in the figure below.
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