Google doesn't do this because no one is posting entries like "My trip to X city - Favorite Restaurants" or "Ski Trip - Awesome Demos" on their public personal

Google doesn't do this because no one is posting entries like "My trip to X city - Favorite Restaurants" or "Ski Trip - Awesome Demos" on their public personal blogs. There is not enough authentic raw data to work with so google is completely overwhelmed by SEO spam. We get around this by specifically telling Google to prioritize results from Reddit as we "happen to know" that Reddit is a more-or-less reliable public forum where real people share their real opinions. The same thing is already starting to happen though. Astro-turfing and bot spam working to manufacture opinion. Reddit is at least slightly resistant to this due to the nature of the arrangement/management of its communities.