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.
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.
A little late getting into this discussion. But my favorite so far is OneOpinion. I think it’s mentioned here. Survey Junkie cool. MyPoints is okay. Ipso, not so much. I did make 300 points today in about 6 hours and every single survey except one I was disqualified for. I was disqualified for the two pointers as well as the higher pointed ones. I’ve never had that problem. Yes you get disqualified, but not everyone out of 30 or so. One of them I actually made to the 98% and was disqualified. I think they didn’t like the fact I was female, except that was answered at the beginning.
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In addition to filling out online surveys for money, you can get rewarded for other actions, too. Some of the best paid survey sites are ones that offer lots of ways to make extra money other than earning money for surveys you take! The most popular websites maintain their following not only by offering various types of incentives but also by providing plenty of different and engaging ways for members to earn money. The purpose of these offers is to turn you into a loyal and active member of their community.
Playing games online: if you like playing games, why not turn the hobby into a moneymaking activity? There are tons of websites out there that reward their loyal fan base with points when the complete a game or play for a certain amount of time. These points can then be exchanged for real money. Sites are able to do this by sharing the profit they make from ads as an incentive for users to visit the site.
Never pay up front. Some companies will ask you to pay a small fee up-front for access to survey lists, which is absolutely unnecessary. Check Terms and Conditions, FAQs, or any other area on a survey company’s page containing information on how the company operates. (If such information is hard or impossible to locate, consider it a red flag and cross that site off your list.)
In the middle of all of this is a new breed of research corporation that relies on you – the survey taker – to determine this information.  For your time?  Many survey companies will pay you to take surveys for money or for other cash alternatives like gift cards or physical prizes and rewards. It depends upon the company as to whether they'll offer money or other offers and special deals.