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I need to develop a Browser Extension able to
copy the information of people contacts that have shared with someone already on Facebook--name, e-mail address, phone number, birthday, Web site, address--then letting one saves it as a spreadsheet file or import it directly into one Gmail address book.
The extension might use official APIs from social networks, as well as emails one has sent, to correctly match all one contact information, and form one giant address book.
It could web-based extension or a software.