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Rajiv Kocherla
LinkedIn formula does not work
http://www.linkedin.com/search/fpsearch?type=people&keywords
={!Contact.FirstName}+{!Contact.LastName}
={!Contact.FirstName}+{!Contact.LastName}
={!Contact.FirstName}+{!Contact.LastName}", "LinkedIn", "_self")
as mentioned in this help article: https://help.salesforce.com/articleView?id=tips_for_using_hyperlink_formula_fields.htm&type=5