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I wanted to start dabbling in Bitcoin, but didn't really want to outlay cash, so I started using the website freebitco.in.
It allows you to earn BTC by "rolling" a number between 0-10,000 once every hour. This is what the most recent payout chart looked like:
You can see that my most recent roll earned 208 Satoshis (1 Satoshi = 0.00000001 BTC).
You may also gamble your BTC in their Hi/Lo betting game, but I would not recommend it as it has a negative expected value (like most casino games).
If you want to give it a go, be an angel and use my referral link: https://freebitco.in/?r=9161352
What's in it for you? Well free BTC, and I have set my account to automatically share 100 Satoshis every week as a thank you for using my referral link: