I do loads of market research surveys. They are not a method of earning extra income which I would recommend to everyone but I live alone so no-one is wanting my conversation and I need to keep my feet up quite a bit so online surveys are OK for me. The companies pay me in cash or Amazon vouchers and that makes a small but significant supplement to my pensions
Once I had been doing on-line surveys for a year or two I started to get invitations to do other things. One of the "other things" is that I'm on a scanning panel. This means that whenever I've been shopping I scan the bar codes for all my purchases (scanner provided) and send the information to the research company. It can be a bit of a faff to do it straight after going shopping but heigh ho, it's not really difficult.
In return for my efforts I get points which can be used to buy quite a wide range of goods. I've been accruing points for about a year and I decided to use some of them to buy a camera -and it's arrived today. Amazon lists it at £89.95 so suddenly that faffing around with a scanner feels a bit more worthwhile.
And maybe I can start putting a few more photos on my blogs.