Freebase.com - Shared Database

This website is a free database which contains information from all over the internet. It is made by contributors which are focused on building a collaboratively-edited database of cross-linked data by collecting information from plenty of websites. It allows users to contribute, structure, search, copy and use data through either the Freebase.com web site or through application program interfaces (APIs). It helps anyone to put data in and pull data out for any commercial or non-commercial purpose. All the data in freebase is linked together and can be collaboratively edited. This service is completely free, you don’t have to pay anything either to contribute data, to search data or build other applications.

“Freebase.com is home to a global knowledge base: a structured, searchable, writeable and editable database built by a community of contributors, and open to everyone. It could be described as a data commons. Freebase.com is enabled by the technology of Metaweb, which is described at www.metaweb.com.”

Not only gives you complete accesses to plenty of information, but also you are able to add reviews and data of everything you like. It is a very appealing site and very well designed.

Any users is able to add data without knowing if it is an expert on what he is writing; How users will be able to know if the data is correct or not?