Velasquez says our information could be used for questionable studies or sold to health insurers, for example. Or it could be stolen, which is a risk with any website that stores personal data. Most of the information we gave away seemed harmless — our shopping habits and travel plans, for example. But information like your birthdate could be used with other stolen data to take your identity. So keep that in mind as you’re answering questions.
Cashback shopping: Who doesn’t love getting cash back? It's a great incentive for shopping because it feels like you're being paid to do so. It's usually best to use the offers only when you were already intending to buy the product. If you love saving money at discount stores or at places that offer cash back, there are a lot of survey sites out there that will open a lot more offers to you. Survey sites can offer cash back because they're paid a portion of the profit for referring you.
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.
Most reviewed paid survey sites effectively promise not to share personally identifiable information or not to share it without your consent. It's an industry standard by which legitimate marketing research firms are bound. But many membership sites reviewed don't make either promise or do so only in a limited or wishy-washy way. Unauthorized go-betweens don't have to honor marketing research privacy standards.

How much are you going to earn using iSay? Their rewards are average compared to the other survey sites out there. Just like with other sites, the amount you get paid is going to differ depending on the length of the survey. You’ll need to accumulate at least 500 points (equals $5) before you can request a payout with PayPal or transfer the money to a gift card. Sign up for iSay HERE. 
Free to join, the site runs a range of special offers, including awarding prizes at random, giving you daily targets to hit for which you receive bonus points, and posting deals on their social media feeds. They have a great new app and a strong referral scheme. However, like everything, it’s not perfect – it can start to suck up a lot of your time. Swagbucks runs on the premise of incentivising day to day internet use to make both you and them money, so it is worth being aware of this so it doesn’t end up seeping into too much of your life!

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).
Something very important to note before signing up at any site claiming to pay you cash to take surveys is that all legitimate sites offering online surveys that pay do not charge registration fees – they are free to join. Some sites may even offer you bonus as you sign in, to show you they are happy you have become a part of their team and helping them increase their revenue.
While there are no clear guidelines, ePoll surveys tend to revolve around the media and entertainment business. So younger survey takers and TV/movie watchers will probably enjoy ePoll more than some of the other demographics. With ePoll, you may be required to watch a commercial, or even a TV episode and then answer questions about it on the survey.
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.
Hi, I live in South Africa and have made quite a few US dollars from various sites over the past few months. For me, Toluna is definitely the best, and they offer nearly daily surveys. You don’t always qualify, but when you do the survey reward is quite substantial. I have never had problems from them and at regular intervals receive money in my PayPal account. However, I cannot say the same of Panel Station. Even though I have sent various requests asking why I have not been paid they do not even have the courtesy, so far, to answer any of my mail – whether they were submitted on the site or sent via e-mail to their “South African” address. I must say that I am very disappointed with them, as they are recommended by quite a few other sites, as well as your own.
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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