Tricksters wishing to circulate the text bomb are advised to copy it from the Pastebin website and share it via the WhatsApp Web app for desktop. So, in the English text we use LRM (left-to-right) directional formatting character, but in the case of this WhatsApp message RLM is used. It won't cause any data loss, it won't force your device to reboot, and it won't prevent you from closing the app and opening it again. The first variant includes an ominous black dot that features a warning on what will happen if the message is opened.
Revealed on Reddit, the message reads "This is very interesting!" and signs off with the popular "face with tears of joy" emoji. It's not as dire as needing to uninstall reinstall but it is a hassle if you'll have to restart both the app and your phone, especially if you need to send important messages to contacts. At present, WhatsApp has yet to acknowledge the bug but it goes without saying that an update should be forthcoming to address the issue, if not already released.
While sending this nefarious message to others is certainly not condoned, you should also exercise caution if attempting to view the seemingly innocent looking line of text on Pastebin out of mere curiosity as it may also hang the browser tab or cause the browser itself to become unresponsive. "Tapping on a portion of the text will basically make the app "expand" the hidden symbols, potentially overloading the app and even the OS", SlashGear explains.
Based on reports over the weekend, several variations of the message seem to be doing the rounds, so we can't tell you exactly what to look for. However, it is still recommended to not click on them. However, it is better avoiding such message forwards. "Create a report of your WhatsApp account information and settings, which you can access or port to another app". There are also complaints of Android phones being disrupted by the message bombs.