Many paid survey panels offer rewards for referring your friends. Help your friends make money online and do paid surveys together. Another reason to refer a friend for paid surveys is because a lot of paid survey site have a set amount threshold that must be reached before you can make a withdrawal. If you are a few pounds away from reaching the withdrawal threshold you can refer a friend to bump you over the limit.
It’s a very well-known scam. You cash the check, then they ask you to either wire some of that money back to them as some sort of fee or buy something for them and send the item to them. So, you deposit the check, then wire some cash to them thinking that the check you just deposited will cover that. A few days later, after you already send them the money, the check will bounce and the money you send to them will come out of your own account.