"Foursquare is a location-based mobile platform that makes cities easier to use and more interesting to explore. By “checking in” via a smartphone app or SMS, users share their location with friends while collecting points and virtual badges".
"The Service contains Content specifically provided by foursquare or its partners and such Content is protected by copyrights, trademarks, service marks, patents, trade secrets or other proprietary rights and laws, as applicable".(Foursquare,2011)
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This means you are not allowed to sell any content that belongs to foursquare for comercial purpose
" By submitting User Submissions on the Site or otherwise through the Service, you hereby do and shall grant foursquare a worldwide, non-exclusive, royalty-free, fully paid, sublicensable and transferable license to use, copy, edit, modify, reproduce, distribute, prepare derivative works of, display, perform, and otherwise fully exploit the User Submissions in connection with the Site".(Foursquare,2011)
When you delete your User Submissions, they will be removed from the Service.
But it does not mean they are gone forever.Because people who have seen this information and saved it somewhere might still have it .(So be careful of what your post it might come back in a couple of years).(Foursquare,2011)
Foursquare is very strict about the images that are posted on the site.(Child pornography will not be tolarated and if found guilty of such material you will be reported to authorities and you are account will be closed.(Foursquare,2011)
Image from http://www.meetyasserkhan.com/personal-development/rules-kids-dont-learn-in-school/
"Foursquare may terminate your access to all or any part of the Service and/or Add-to Link at any time, with or without cause, with or without notice, effective immediately, which may result in the forfeiture and destruction of all information associated with your membership. If you wish to terminate your account, you may do so by following the instructions on the Site".(Foursquare,2011)