Recent valuations of major mobile instant messaging (IM) players on the market suggest that the larger the user-base the more valuable each user becomes. This premise may be based on advertising revenues alone so monetizing more features is likely to increase the value per dollar per-user. For example Viber, bought for $900million (approx. €695million) suggests each user is worth around $9 (approx. €6.95) whilst WhatsApp, the market leader, was bought for $19billion (approx. &euro....