Wikipedia: Often maligned for its free, user-generated content, science hounds need not hesitate to begin their search for a science encyclopedia online at the world's most famous online encyclopedia.
According to Wikipedia, there is some difficulty in defining the eye color "hazel" as it is sometimes considered to be synonymous with light-brown and other times with dark green.
Google Maps - Google maps can be customized to provide only maps, or maps overlaid with additional information such as photos, videos, webcams and even Wikipedia entries.
In Brazil the Acai is an important crop because the Acai berry makes up a huge part of the diets of Amazonian people-as much as 42 percent according to Wikipedia.
Encyclopedia Britannica: The gold-standard in encyclopedias disputed the study comparing Wikipedia favorably with this print encyclopedia, also available online.
This "buzz' is also known as "viral marketing," which Wikipedia defines as using existing social networks to create brand awareness of a given product.
A report commissioned by scientific journal Nature found that Wikipedia was nearly as scientifically accurate as the notable Encyclopedia Brittanica.
Here's a description of them at the Wikipedia (http://en.wikipedia.org/wiki/Help:Footnotes)
I also observe that some external links should be allowed, particularly to Wikipedia, but understand the need to keep spammers at bay.
Of course, Wikipedia is another textbook example where people toil for no payment, and anonymously as well.