If you have lots of free time on your computer, you might be interested in Swagbucks Tasks. Much like amazon's mechanical turk system, you earn Swag Bucks by doing different tasks. The reward amount will vary depending on the task and the time it takes for the task to be completed. After opening the page there will be a list of tasks for you to do. On the left side on a button is the amount of Swag Bucks you can earn for each specific task.
To start the task simply click on the button. In the center of the homepage is a description of the task and the requirements for completing the task. Sometimes you will be required to complete a pre-test (sometimes called training mode) to show you can properly do the task. On the right hand side is the number of times a task can be done. Sometimes you won't qualify for a task or the quota might have already been met.
As you complete tasks there will be a percent bar at the top, which will let you know how many Swag Bucks you have. Once you reach 20 Swag Bucks, they will deposited in your account. This can take up to an hour, so be patient with it. While doing the tasks, make sure to do them properly since Swagbucks keeps track of your accuracy to help decided which tasks you can do. You can also find your accuracy at the top of the task you are working on. In the end, tasks can be a good way to add some extra Swag Bucks to your account if you have free time on the computer.