The OpinionPanel site is a research community where you can earn some extra cash on the side in the form of vouchers or Paypal money. Unfortunately, it is only available for those in the UK. The most attractive part of the scheme is of course the compensation. They provide up to £4 for each survey you complete or £70 for longer discussions.
Join here: https://www.opinionpanel.co.uk/
While it may not be a scam in your opinion, it could be considered spam if this is the only type of content you post. Spam is not appreciated by the community and could be flagged or may result in action from the cheetah bot..