On: You can't google 9999999..99999999999999999999999

[user24]

The reason for this is that you can google ranges of numbers, and people a couple of years ago were using this feature to find credit card numbers that were posted online, eg searching for 4000000000000000..4999999999999999

It was around the time that johnny's google hacking page became popular, iirc. (http://www.hackersforcharity.org/ghdb/)