I'm creating a travel website that lets users select points of interest for a particular city (a restaurant, museum, etc.). These records are to be displayed on a google map as markers. This I've done already.
My question is should I integrate with 3rd party data to make creating these markers easier, cleaner (no duplicates), and utilizing data (info, reviews, photos, etc.). If so, can anyone recommend what services are available?
I want the user to be able to search for the point of interest (POI) and select it from a list. I'd like to be able to lookup information, reviews, photos, etc. too if possible.
What are other travel websites doing? Did sites like trip advisor, virtual tourist, start with nothing and build their data from scratch?