You sound like you're from the Google team ;)
Rough steps:
1. Monitor keywords
2. Jump in to sway conversation
3. Profit
I'm not saying this is happening. Purely hypothetical.
Right, so who's doing the jumping in to sway conversation?
Full disclosure, I am Xoogler, but if anything I think that makes my skepticism even more justified. If there were people there paid to post nice things about Google on HN and Twitter then I'd love to apply for that team!