Yes it has . Article 3(h) of the consultative Act of the AU stipulates that one of the objectives of the AU is to promote and protect human and people's rights in accordance with the African Charter and other relevant human rights instruments.
The ACHPR is established in terms of Article 30 of the African Charter with the mandate to protect and promote people's rights and ensure their protection in Africa and to interpret the African Charter.
The ACHPR is a quasi-judicial structure empowered to issue recommendations. Though these recommendations are not binding , the African Commission has maintained an impressive track record of upholding the right to freedom of expression online and offline both in its communication and through the development of soft law instruments.