i see.. u r trying to do ur online findings first...

to fully utilize your search in the net, u really need to search deep... i mean really deep.
u also have to make sure the person u r searching is really an "internet person", where she use internet frequently..

use several search engine and learn the query in the search engine.. first best is google;
these are some thread b4 about google queries, there r more..

http://www.antionline.com/showthread...hreadid=244430
http://www.antionline.com/showthread...hreadid=257512

for eg: intext:"peter parker"

use other type of search engine, as the crawlers in the engines works differently,
for eg: use www.ask.com to search deep in discussion forums...

be creative with search engines..

some webpages restricting the search engine crawler, so if u r able to know her habbits, try to go to forums, community that she intended to go to.. and search for her...

for eg: goto friendster; if u find her; ask all the close links to her..

I tried google way, to search an old friend, seems to work.. i even found his phone number, address, and latest photos..

i think this kind of things threaten personal privacy, hmm..??? sometimes internet do works that way..

peace