what is a valid facebook url
A Uniform Resource Locator (URL) (commonly informally referred to as a web address, although the term is not defined identically) is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it.ost web browsers display the URL of a web page above the page in an address bar. A typical URL could have the form http://www.example.com/index.html, which indicates a protocol (http), a hostname (www.example.com), and a file name (index.html).