For the test, I delete the Foursquare account.
First go to the account using your login and password, then click on the user’s icon in the upper right, select “My profile” – “Privacy settings”, in the text we find the link “delete your account” and click on it.
Direct link to delete:
https://foursquare.com/delete_me
In the opened page, you must specify the reason for the deletion and click “Delete Account”, then enter the password for confirmation.
That’s all.