Track Facebook users that visit a site

I want to track users that visit a Facebook site.
Create object for browser
View source
Search for, 'mobilefriends'
Filter and capture user links, ie, 1234567,12345777, 98765443......etc
Build new browser address, Facebook.com/1234567
When address returns, capture new address line...this now contains user name
Build data base, track all data: user link, user name, date, times visited (only run once a day)
Did I miss anything ?
Thanks