Retrieve Facebook id from username

Question

I would like to retrieve a Facebook user\'s id given their username.

Example: Given helloworld return 100003263065603.

I understand th

Answer 1

Those sites most likely scrape the profile page, which is not allowed. Don´t do that, should not need to anyway. Just let the user authorize your App and you will get his (App Scoped) ID. There´s no serious application for using the username or his global ID anymore.