But beware, if it concerns stuff that is already on FB or on partner sites with similar ToS one has signed away ones rights. IANAL but this is from the FB Terms:
>> Specifically, when you share, post or upload content that is covered by intellectual property rights on or in connection with our Products, you grant us a non-exclusive, transferable, sub-licensable, royalty-free and worldwide licence to host, use, distribute, modify, run, copy, publicly perform or display, translate and create derivative works of your content (consistent with your privacy and application settings). This means, for example, that if you share a photo on Facebook, you give us permission to store, copy and share it with others. [..]
>> When you delete content, it's no longer visible to other users; however, it may continue to exist elsewhere on our systems where:
>> - your content has been used by others in accordance with this licence and they have not deleted it (in which case, this licence will continue to apply until that content is deleted);
The Privacy Policy states that you are responsible with whom you share your content, after which above license applies.
>> Specifically, when you share, post or upload content that is covered by intellectual property rights on or in connection with our Products, you grant us a non-exclusive, transferable, sub-licensable, royalty-free and worldwide licence to host, use, distribute, modify, run, copy, publicly perform or display, translate and create derivative works of your content (consistent with your privacy and application settings). This means, for example, that if you share a photo on Facebook, you give us permission to store, copy and share it with others. [..]
>> When you delete content, it's no longer visible to other users; however, it may continue to exist elsewhere on our systems where:
>> - your content has been used by others in accordance with this licence and they have not deleted it (in which case, this licence will continue to apply until that content is deleted);
The Privacy Policy states that you are responsible with whom you share your content, after which above license applies.
https://m.facebook.com/legal/terms/update
Edit: misread parent, adapted accordingly