Right now, if you refer 4 friends to sign up for Acorns, you can earn a $250 bonus. Your friends can also receive a $5 signup bonus. If you have a lot of friends, you could even discuss splitting the reward. Founded in 2012, Acorns is a company focused on automated investing and smart money management. Its biggest feature is that every time you make a purchase, you can use the round-up feature to automatically put a small amount of money into this investing app. For people who are not very good at budgeting or saving, this can be a great option.