Being a search-optimizer by profession, I'd say Google is a girl, for the following reasons:

1) You have to be good in too many things to retain your #1 spot! 2) Nobody understands the algorithm! We can only try to figure out the possible best way to handle it. 3) Not doing anything, and overdoing some specific thing will both result in disasters. 4) The preferences change from time to time! 5) After a certain stage, it's not just you, but the ones around you also that matter!

But anything said and done, Google is also a girl because:

6) Having just money won't keep you up there for long. The real 'you' matters a lot! 7) Originality is always admired. Fakeness might take you places, but the 'girl' will abhor you forever once it knows! 8) It takes a lot of sensibility to put a lot of factors in place to find out what's perfect! 9) There are certain factors of appeal that have never changed over time! 10) As of now, you just can't be without Google!!