1. Create a button “Search in LinkedIn” in Contact object. Use “Execute JavaScript” as the Behavior. In OnClick JavaScript, use the following:

window.open( 'https://www.linkedin.com/search?lname={!Contact.LastName}&fname={!Contact.FirstName}");

This will allow us the search using the Contact First Name and Last Name.

2. Add the button to the page layout.

3. Click the button to see the result.

Output: