Zao was a Chinese app that allowed users to swap their face with celebrities, actors or other people in videos and photos using deepfakes. However, it was shut down due to privacy and security concerns. Here's a review:

Face-swapping: The key function allowed users to select a selfie photo and replace their face with a celebrity's face in movie clips, TV shows, or other videos with a single tap.

AR effects: It also had augmented reality filters that could modify a user's facial features in real-time, like changing eye or hair color.

Extensive celebrity database: Zao had a large collection of faces from movies, TV shows and social media profiles to choose from for swapping.

One-click generation: Deepfake videos could be instantly generated on a user's phone without any expertise needed.

Sharing options: Users could share their generated face-swapped videos and photos on social media.

While novel and fun to use, Zao raised serious privacy, legal and manipulation concerns such as:

Potential for misuse and fake content spread without consent.

Security of the facial dataset it collected was questionable.

Deepfakes can undermine trust in visual media and blur lines between reality and deception.

Authorship and ownership issues when faces are non-consensually swapped.

Overall, the app highlighted the need for better governance around such AI technologies to prevent harm. Most experts agreed deepfakes require responsible use and oversight.

Zao also offers a range of pre-existing video templates that enable users to insert their faces into popular movie scenes or music videos. This feature allows users to experience the thrill of being part of their favorite films or music videos, albeit virtually.

Furthermore, Zao provides users with the ability to generate personalized GIFs and images by replacing faces in existing media. This can lead to humorous and creative content, providing a platform for users to express their creativity and share entertaining visuals with friends and social media followers.

It is important to note that while Zao has gained popularity for its impressive technology, it has also faced criticism due to concerns over privacy and the potential misuse of deepfake technology. Deepfakes have the potential to be used for malicious purposes, including spreading disinformation or creating non-consensual explicit content. These ethical concerns have sparked discussions around the responsible use of such technology and the need for robust safeguards.

In conclusion, Zao is a technology that showcases the immense potential of deepfake algorithms by allowing users to seamlessly insert their faces into various media. While it offers entertaining and creative possibilities, it is crucial to approach this technology with caution and consider the ethical implications surrounding deepfake technology.