I recently received this message, apparently a mass text message, from a WhatsApp group:
There is a watsup group called' Interschools, if invited, don't join the group, it belongs to Daesh(ISIS). If you join the group you will not be able to exit from it, be vigilant, please inform others. My dear send it to your relatives and children on watsup so that they will also be careful.
When I searched Google for "interschools whatsapp group," I found several hits, but none from websites that I know to be trustworthy. I also found a repeat of the warning on several sites, including this forum.
Is this claim true?
I am not aware of a mechanism by which one could be made unable to leave a WhatsApp group (onlinethreatalerts.com says that "there is no group on WhatsApp that you cannot leave or exit which you have knowingly or unknowingly joined.") However, it is possible to repeatedly add a number to a WhatsApp group even after the owner of that number has left the group, so I'm not sure that this piece of information alone is enough to debunk this claim.
The spelling and grammar of this message, besides the improbability of the claim, lead me to believe that it's a fake; however, my Google-fu has not turned up better evidence one way or another.