Here is an interesting article that I read about mashups and how relevant is the data in it. An excerpt from the article ,
"Creating a mashup has never been easier. Initially, programmers had to hack into the mapping systems to work out how to plug location data into them. That changed when the major mapping site owners - Google, Yahoo and Microsoft - recognised that they could gain exposure from a mashup. They now freely publish application programming interface (API) software that allows latitude and longitude data to be injected into their maps, whether it is the address of a sports club or the location of a traffic snarl-up.
Central to the problem is the fact that the mashup developer does not own the data being mashed, while the owner neither knows nor cares that their data is being used. "How do you know the data is real?" Rossman asks. Without an exchange of encrypted ID certificates between source and mashup, the data could be coming from a hacker's "spoof" site, he warns."
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