|user name or URL of the Facebook page at which the point of interest can be contacted|
|Group: Social Network|
|Used on these elements|
|Status: in use|
|Tools for this tag|
To define a Facebook-Page or -Profile of an object. The value is the Page-/Profil-URL or the Pagename. In most cases, the full URL is used as value. It is also possible to add the user name or page name only (the part after the last '/'). This requires the user software to add the appropriate URL prefix, but it makes it easier to adapt to special needs like offering the mobile version of the page or a random language version.
It must be an official way of contacting.
The key facebook=* is in use as well, but less often.