1. How to Earn Bitcoin Online

2. If you want to earn Bitcoin online, this is a post that
will help you do just that. Bitcoin is the world's first
peer to peer crypto-currency that isn't controlled by
any central issuing agency but is rather an open
source protocol that is followed by all the people who
participate in the economy. No one can manipulate
the supply of Bitcoins and all transactions that take
place in this economy are cryptographically verified
through a process called Bitcoin mining. Your Bitcoins
are as secure as public key cryptography can be.

3. Make money online and convert them to
Bitcoin
Believe it or not, it is still much easier to make US
Dollars! You can then exchange these dollars you make
for Bitcoin at any of the exchanges such as Bitstamp or
Coinbase if you're located in the US.

4. Earn Bitcoin Directly in the Bitcoin
economy
There is a small but very vibrant community where you
can do most tasks, but at a much smaller scale. For
instance, you can take up a part-time job for Bitcoin
on Coinality or you can end up with a small gig on
Coingig. These are real life equivalent of sites like
Elance and Fiverr but in the Bitcoin ecosystem.

5. Advertising
The advertising industry in the Bitcoin economy is, not
surprisingly, pretty robust. This is because there are
ton of new Bitcoin based services that keep coming up
all the time and they all need a good advertising
network.
CoinURL allows you to place Google AdSense styled ads
on your website and other services like Bitads lets
advertisers bid for banner space on your blog. There is
also a-ads that allows you to make money through ad
impressions without reference to the clicks (so it isn't
PPC). If you're a publisher - blogger or webmaster, you
can earn some Bitcoins through this route.

6. Going Social
There are sites that will pay you for your activity. CoinChat is
perhaps the best known site in this category. It pays users
a few milli-Bitcoins for chatting on their site. These are
random and controlled by an algorithm that takes into
account your activity and how well you're contributing to
the discussions at hand.Another way in which a lot of
Bitcoin enthusiasts earn some Bitcoin is by selling their
forum signatures at Bitcointalk forums. There are a good
number of advertisers who are willing to do this, and for
the socially active member who values interaction through
this forum (it is the same forum through which Satoshi
Nakamoto introduced Bitcoin to the world), selling
signatures can be lucrative.

7. Sources:
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http://www.coinsetter.com
http://ezinearticles.com/?How-to-Earn-BitcoinOnline&id=8030851