[BAD] Foursquare doesn’t allow you to mix Foursquare data with other databases

[mmedjaoui]

We welcome you to use foursquare as your location database. You can associate additional content with our venue data in your system, but you may not combine our database with another database or export it on your own. Examples

• DO associate Wikipedia articles to foursquare venues and show them to users
• DON'T perform a search across both foursquare and Google Places, then return a combination of their results/data.

If you use any "Explore" Foursquare Data you will not co-mingle any ranking and/or signal information obtained from such Foursquare Data with your own or third party ranking and/or signal information.