You know when you're seeing something truly special for the first time and I've probably not been as excited about an app since seeing the likes of Facebook, YouTube or Twitter. Although Voxer has been around for a year, it has gotten a lot of funding and more crucially, it has support at grassroot level with loads of non-techies using it already.
The huge social success stories like this (Facebook, Instagram, Whatsapp, etc.) always happen before the mainstream press see them coming and this is no different. It's a huge claim, but for me, Voxer will be the big success story in social media in 2013. You won't believe how good it is and it could be the final nail in the coffin for SMS.