What does adding v mean?

Add v means add WeChat.

WeChat is a free application launched by Tencent on January 21, 2011 to provide instant messaging services for smart terminals. It was created by the product team of Tencent Guangzhou R&D Center led by Zhang Xiaolong.

WeChat supports cross-communication operators and cross-operating system platforms to quickly send free (a small amount of network traffic is required) voice text messages, videos, pictures and text through the network. At the same time, you can also use *** to stream Media content information and location-based social plug-ins such as "Shake", "Drift Bottle", "Moments" and other service plug-ins.