I would like to start an online business to give back to the online community and make some money in the process. What are some ways I can do that?

You could create your own websites and earn money by using Google Adsense on your websites. Registration with google is free.

If you got a website or a web-blog, you could make money with putting advertisements on your site (by google). If someone clicks on these ads, you will earn money.

If you don’t have a website, you may start creating web-blogs (mostly free) with advertisements (google ads) on it.
For more information, visit following site

http://www.makemoneyexpert.com/makemoneywithgoogleadsense.htm

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You may sell things at Ebay. Some people do business with Ebay and they just live on income from ebay. You may like to look at it.

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EBAY GUIDE

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AFFILIATE PROGRAMMES

You may register with the well known affiliate programme and start earning money by promoting famous products, for example, Dell, Sony. Registration is free.

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You may visit make-money forum to see more about making money.
http://www.make-money-system.co.uk/forum/