You can earn quick money by registering for InboxDollars. You’ll get a free $5 bonus today when you sign up! You may have to wait a bit longer to get to $100, but it’s still easy money by doing things you do online anyway, like listening to music (yes seriously), watching ads and a variety of other things. Plus, you get $5 just for signing up (just name and email address).
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(As an example, this still happens, even now: Just recently, I spent 4 months working on a business idea with my team, spending a huge amount of time and money, until we ultimately concluded it wasn’t worth it. We shelved it away and I wrote an email to the team, telling them, “We can’t figure out how to make this work. We’ll re-look at it in 2 years.”)
I personally like this one for some spare cash. It does not take much to earn an extra $20 – $50 a week. Some claim that they are able to make a living by dedicating their time to different jobs at mTurk. You will have to go through a learning curve, but once you get comfortable, you will find plenty of good and interesting HITs (Human Intelligence Tasks) to work on.