Not a lame question, actually a very good one. Each program tracks your earnings and pays them separately, so you should have your tax information on file with each. As part of the sign up, each one will ask for a social security number and your personal information for tax purposes. If you earn enough money in a year, they will send you a 1099 either late January or early February that shows what earnings were paid to you. You'll use that to report your income to the tax authority.
The reporting threshold depends on the company. For instance Ebay reports to the IRS once you have reached $20,000 in receipts. Amazon files at $600. So check the sites to determine what their rules are.
That being said, you are legally required to report all income. So if you only receive $100 in a year, you may not receive a 1099, but you still have to report that income on your return. If you don't, and get audited, you could face penalties and interest on the unreported amounts.