Who owns the copyright?
Using social networks legally: copyright

In the absence of proof to the contrary, it is presumed that the author or owner of the rights in a work is the person whose name(s) appear(s) on or next to the work. The creator may decide to assign his or her economic rights (reproduction and representation rights), whether exclusively or not, to a publisher, producer, employer or any other person of his or her choice.

Moral rights, linked to the author's personality, can never be transferred. They enable the author, and subsequently his heirs, to claim the right to have his name mentioned and to ensure that the integrity of his work is not compromised.

The challenge here is to find the rightful owner of the rights you need to use a work within the framework you have defined.