Especially when it's from the "head of the webspam team at Google". It's the start-up equivalent of being called into the principles office.

No kidding

Oddly, you're the second person to have misspelled it as "investing" when quoting it on this thread. Is this like a rogue / rouge thing that people get commonly tripped up on?

Oddly, he's not wrong either: http://www.mattcutts.com/blog/disclosure/

Autocorrect is pretty great at turning a typo into an alternate word.

Post above yours also did principle/principal. The one no one seems to mix up is awful/offal.