The most used task is the shortlinks, although they are the most annoying, will be where will come the majority of your Coins!
This task is the simplest one, you just need to click a button to get the reward, but the button only enables every 40 minutes!
This task is a bonus / extra task, you need to complete other tasks to get some good bonus by unlocking daily and weekly achievements!
This task is very comfortable to complete, you just need to watch some advertised websites and you will receive your Coins!
Offerwalls are nice way to earn a lot of Coins by answering some questions, viewing sites, registering on service and downloading apps.