Change blocked people and apps privacy setting on facebook
Go to your Privacy Settings page, which you can access from the Account dropdown menu at the top right corner of every Facebook page. After that click on Edit your lists.
Here you can change the setting of Block Lists section, which lets you block people from interacting with you or seeing your information on Facebook. You can also specify friends you want to ignore app invites from, and see a list of the specific apps that you’ve blocked from accessing your information and contacting you.