One of the easiest ways to manage your online presence is simply to set up a Google Alert for your name and any variation thereof, e.g. Lucas Smith, Luke Smith, L. Smith, Luke S., Lucas "Smitty" Smith, Captain L. Smith, USMC, etc.
If any of the names that you have placed an alert on appears on the web, you will receive an email notification.
If you don't regularly Google yourself, although I highly recommend that you do, this may be an adequate substitute for you.
Personally, I'll continue to do both - better safe than sorry.