Harris Poll has made a strong presence in the market research industry. They are a member of the National Council of Public Polls (NCPP), the Council of American Survey Research Organizations (CASRO), the Council for Marketing and Opinion Research (CMOR), and the European Society for Opinion & Marketing Research (ESOMAR). The firm abides by the  standards of these organizations, thus proving their reputability.
First, thank you for providing this extensive list. I wanted to offer a quick follow up. After reading your post I decided to give Survey Junkie a try and I’ve already closed the account. Yes, I can tell it’s well organized and it is definitely a user-friendly platform. The problems I experienced were first that not one of the surveys they emailed me about were available. I did, however, complete several surveys from the site itself and I found them to be lengthy – in itself, not a problem, but 3 out of 5 told me I didn’t qualify after I’d already invested 10 – 12 minutes filling out the forms. They got more than enough information from me to be useful which is an old and highly unethical trick in market research – which happens to be my background. All in all, it was a LOT of wasted time.
Product testing can be a fun way to make some extra money and also get a chance to try something new before the general public. This should be treated as a bonus though, as you have no control over whether you’ll be chosen, as it is down to whether the company thinks you are the correct audience. The firm also runs lucky draws throughout the year, where you can win between $500 and $5,000, and you are entered into them as a reward each time you fill out a survey.
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. 
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.
By only sending you questionnaires you are already qualified for, Pinecone wastes far less of your time than many sites which require you to fill our qualifying questions before starting each survey. However some users have said they don’t receive very many surveys, which could be a consequence of their careful filtering. Equally the site retains the right to remove you from their panel if you no longer fit their desired demographic, so make the most of your membership while you have it!

InboxDollars. New users get a $5 bonus after confirming their email address with InboxDollars. But that didn’t make up for how little we earned per hour while taking surveys — 41 cents, the lowest rate among the 12 sites we tested. On occasion, instead of sending us surveys, the site directed us to promotions that required our address, phone number and birthdate. Read our InboxDollars review.
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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