You might want to check on this post.. It’s under the topic “cost of living”. The poster is promoting several “survey” dodgy data collection websites/apps. If you click on the link and sign up she gains a “small referral”. I’m not sure this is allowed 
www.mumsnet.com/talk/cost_of_living/4627520-swapped-my-instagram-addition-and-made-ps1767-last-week