Referral marketing platform Gleanin has announced that visitors registering for events with its Gleanin Connect platform will now be able to use WhatsApp to broadcast their attendance. Whatsapp is the most popular messaging app in the world, with a global userbase of over one and a half billion. By allowing visitors to invite their Whatsapp contacts before an event, Gleanin Connect hopes to reach new potential visitors. Referral marketing is quickly becoming one of the primary c...