If you put your mind to it. That is my answer. There are dozens of sites where you can read or write to earn a buck or two. Off course it is always an option to start a blog and use google adsense to get clicks.
Google can also be implemented on any website you have if you follow their rules.
There are a few sites on facebook where you can earn some money and my experience is they do pay. You could read back in my blog to learn about cloudcrow. This sites pays every day through paypal.
So a short note, just to let you know you can, just read the articles I wrote about it to get you started!