Example of Facebook ID number?
When you create a Facebook account, the Facebook servers automatically assign you an identification number, known as the Facebook ID. In an update done in the spring of 2009, a user's Facebook ID number was replaced with a "vanity" user name of the Facebook member's choice.
See above, 1595527473 is the Facebook ID number.
However, marilena.crusafio is the Facebook ID username. You must find the Facebook ID number from that Facebook ID username using the tool below:
Free Tool To Find Facebook ID Number »
With the above free tool, you can get your own Facebook ID, your friends Facebook ID, or a Facebook groups/fan pages ID programmatically.