Not everyone has a whatsapp account. And without registration in whatsapp, your link does not work. When you post such links you need to make a note about it.

Har kisi ke paas WhatsApp account nahin hota. Aur WhatsApp mein registration ke baghayr aapka link kaam nahin karega. Jab bhi aap aisi links post karte hain, to is baare mein kuch note karna zaroori hai.