Whatsappshare module provides a link to share your page and custom text after node title of every page.
Once enable the module then go to /admin/config/services/whatsappshare page.
Whatsappshare module provides a admin page to customized -
1. Text (Share) which will appear after title on every node page.
2. An option to manage the size of whatsapp share button size.
3. The custom text which has to be share.
Original idea is inherited from http://whatsapp-sharing.com/