There were more than 1000 friend requests in my Foursquare account and it was time to clean up the list. Foursquare doesn’t offer a “Select All” option so you cannot accept, or reject, the pending friend requests in bulk. And it would take just too much effort to click that Accept or Ignore button manually as you’ll have to do that for each pending request.
Accept or Ignore Foursquare Friend Requests in Bulk
Go to the Foursquare.com website and choose Friends -> See All Friend Requests