Which of following app implimented the video call feature first?

مندرجہ ذیل میں سے کس ایپ نے ویڈیو کال کی خصوصیت کو پہلے نافذ کیا؟

Facebook

Skype

What's app

None

Skype is a proprietary telecommunications application that specializes in providing VoIP-based videotelephony, videoconferencing and voice calls.