Based on the search results, "wb" could refer to WhatsApp Web, which is a browser-based PC client of WhatsApp. WhatsApp Web allows users to send and receive WhatsApp messages online on their desktop PC or tablet. Users can log in to WhatsApp Web using their smartphone to authenticate themselves as the owner of the account. WhatsApp Web has the same functionality as the WhatsApp on a users mobile phone, and all messages are synced across devices.

It is also worth noting that there is an app called "Web Messenger for WhatsApp Web" available on the App Store. This app allows users to access and benefit from the web version of WhatsApp and other messaging applications.

In summary, "wb" most likely refers to WhatsApp Web, a browser-based PC client of WhatsApp that allows users to send and receive messages online.