Don’t overshare. If you’re asked to give your Social Security number, bank account number or driver’s license number, leave the survey. Velasquez recommends being “intentional” with sharing other private information with survey sites. Answering questions about a TV commercial probably is fine, but giving medical information may not be worth the risk.
A few paid survey sites do pay relatively well in cash. However, many sites hype hypothetical, best-case scenarios that can't possibly apply to each and every consumer for each and every hour of participation. In the real world, the likelihood that you'll often earn the higher of the hyped amounts is slim. Most online paid surveys simply don't pay much, and you must be invited to complete them. To be invited, you must fit targeted demographics. That alone limits your earnings right off the bat, as you can't possibly fit every demographic.
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Survey Junkie makes it quick and easy to jump into the survey game. According to their websites, they say they are the most popular spot online to earn cash and rewards for sharing your thoughts, while that might not be technically true, they are one of the largest survey sites out there. They were launched all the way back in 2005 (which is pretty old for a survey site) and they have over 4,000,000 members. 
Disclaimer: NerdWallet strives to keep its information accurate and up to date. This information may be different than what you see when you visit a financial institution, service provider or specific product’s site. All financial products, shopping products and services are presented without warranty. When evaluating offers, please review the financial institution’s Terms and Conditions. Pre-qualified offers are not binding. If you find discrepancies with your credit score or information from your credit report, please contact TransUnion® directly.
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.
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.

Above all, thanks for that great article. I really enjoyed reading it all for the last 5 minutes with a mug of coffee! Despite this article being next to perfect, if I can, I’d like to add one of the best survey sites, in my mind, to this list. It would be, “ClixSense”. They’re a really old, and huge, presence in the research industry and have partnered with many of those listed in this very post. So, signing up on ClixSense lets you take paid survey invitations from multiple survey sites and research firms, like Opinion Outpost, Nielson Media Research, YouGov, I-Poll, MySurvey, Toluna and more. Almost half of all of those survey sites are listed here.

Define the research question: This is critically important to the success of a survey research project. Without a clearly defined question, it is difficult to determine the best approach for conducting the survey. For example, based on the research question, are the needed data exploratory, descriptive, or causal? The answer to this basic question has huge implications for the entire research process, yet it is often not directly addressed.
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