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.
The concept of data mining and profiting off that data mining isn't anything new.  And while some companies engage in some rather disreputable practices to do this, Global Test Market seems to be doing just fine with the whole “consent to disclose” thing.  More importantly, in some cases this may help you as some companies will offer to do more specialized product testing once they've identified you as their target demographic.
This site pays highly – at least $3 a survey and up to $6 for testing products. If you stay with them, the pay even increases by a few dollars, taking the wage far above the standard survey rate. Owned by the renowned New York market research company Nielson, Pinecone offers a variety of content and emails surveys to members as and when they are suited to you.
A popular and free survey site, Toluna boats more than nine million users across the globe and is well known in the industry, having been running for 17 years. Offering questionnaires for you to fill in to provide leading companies with your opinions, Toluna also runs a range of internal games and schemes, as well as offering product testing to some lucky users who can bag free products.
Although it might seemed biased to put forth this assertion, the proof is truly in the pudding. Whereas virtually every other way you can earn money online will require some level of skill, more time or the like, paid online surveys consistently offer consumers an opportunity for completely autonomous and consistent participation. This means that there are no contracts, fillers or complexities to navigate, just simple, unadulterated activities that put extra cash in your pockets. 
Allan Liwanag is a personal finance blogger who paid off at least $40K debt in 3 years by adopting simple and extreme saving techniques while ensuring his family's needs were taken care of. An analyst by day and dedicated blogger by night, he loves to share his thoughts - based on his research, personal knowledge, and experience - on topics related to family, life, and money. Allan lives with his family in Maryland, USA.
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!
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. 
I’ve had bad experiences with iPoll. I’ll answer the “screening” questions and am told I qualify to take the survey, then once the survey is around 90% complete, I’m told the survey is “closed”. My guess is this is how they’re getting their data without having to pay participants. I’ve also gotten “invalid website” in the middle of some of their surveys as well, of course, after answering 15 minutes of questions.

While product testing is offered, you’ll only get sent items if you qualify, and then it will only be a couple over the space of several months, so think of this as a bonus, rather than a regular part of your work. Some users get frustrated at the length of time they have to wait for vouchers to arrive after they order them – especially when somewhere like Opinion Outpost will pay out straight away. However it is unfortunately quite standard to have to wait weeks for payment from survey sites. Surveys range in duration from about 15 to 30 minutes and there are mini polls on the website which can help you tot up small amounts of extra points. Points do sometimes take days or even weeks to appear in Toluna accounts, which is worth noting.
When you complete an online survey the results end up with a business’s decision committee who then will take all the opinions that have been submitted honestly and a new product or service will be born. If you’re not a member yet, join today by clicking on ‘Join for Free’ anywhere on our site. Experience it for yourself, there are no obligations so you can choose when you decide to participate and to thank you for taking part we reward you too.

Rewards are paid out in cash and PayPal, but the catch of having short surveys is reflected in the pay, which can be miniscule per survey. As you need to earn $50 before you can withdraw anything, that’s a lot of low-paying surveys before you’ve made your money! Some people have complained online that once you get close to the withdrawal amount, the surveys dry up. One way around this is to refer a friend as you’ll receive a bonus when they sign up and you’ll hit your target to withdraw your funds. It’s a bit of a downside, but there are hundreds of very happy consumers who love the site, so it’s worth a shot, especially if you get fed up with the boring or repetitive nature of some of the quizzes elsewhere.
Pinecone Research works a lot like other paid survey sites. Once you sign up, you’ll earn points for each survey you complete. As an added bonus, the responses you give during surveys will help you learn about new products before they hit the market and influence their respective marketing campaigns. And once you start racking up the points, you can redeem them for cash or prizes.
This is where it can all go downhill quickly.  In the pressure to make as many pennies out of a nickel, a lot of research corporations will not just sell your answers but the data associated with it.  Details that you provide when taking paid surveys such as your name, address, age range can all be attached together quickly to fulfill a lot of larger companies' requests for information (RFI).
There are also many questionable "middleman" third-party paid survey sites that hype easy money for participating in online marketing research from home. Here, the old adage is true: if it sounds too good to be true, it usually is. Further, it’s worth knowing that there’s a lot of competition among these companies for your participation – which means potential for exaggeration, at the very least, if not outright scams.
If you're looking to make money by completing surveys online – this site will not be very helpful for you.  Like the previous sites, they will take, retain, and sell your information to anyone that waves a dollar in their faces.  UNLIKE previous sites reviewed, they hide their consent for that information.  It's buried.  So not only do you make silly reward points that don't translate to cash but every third party service and product solicitor has your personal information.
I don’t see PaidViewpoint on your list. I like using that site. I signed up for it on June 28, 2016, but I guess I forgot about the site and stopped using it on July 24, 2016 but had a total of $1.91. I started using it again on May 5, 2018, and I’m now up to $27.05 and have a trait score of 10, which is the highest. The surveys are easy and you don’t get disqualified. I mostly earn 10 cents, but once in awhile I earn some good money like 62 cents. It does take awhile to add up, but it’s free money.
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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