Create a Custom Field Hyperlink that will Search the Profile of a User in Facebook

1. Navigate to Customization > Lists, Records, & Fields > Entity Fields > New.
2. Enter the Label of the field.
3. Set the Type to Hyperlink.
4. Store Value should be unchecked.
5. In the Validation & Defaulting tab:

• Default Value = '<a href="https://www.facebook.com/search.php?q=' || {firstname} ||'%20'|| {lastname} ||'">https://www.facebook.com/search.php?q=' || {firstname} ||'%20'|| {lastname} ||'</a>'
• Formula = Yes

6. In the Applies To tab, select the record you want to apply this field.
7. Click Save.

Note:  This applies to entities that have the First Name and Last Name fields populated.