For an easy way to lookup and connect with people and companies across the web (and all of its many social media outlets) check out the Firefox extension Tabble. Tabble provides you with access to all of an individual's relevant online information and can even show you relevant e-mails in your Gmail account if applicable.
For more information on Tabble, take a look at this segment from Tekzilla and their addon page in Mozilla's extension database located here.
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