MTN is getting into the social networking scene and has launched its instant messaging service, dubbed noknok. 

noknok is exclusive to MTN subscribers and is available for download to mobile phones as well as PCs. Customers are able to join chatrooms and even create their own private chatrooms between friends as well as share picture files with each other.
The noknok PC application allows pictures, files and voice recordings, as well as SMS and MMS from their PC.
noknok makes it easy to invite friends by allowing direct access to a user's mobile phonebook.  It also allows users to “chat” to other MTN customers who are not on noknok, by delivering an SMS and allows them to respond via SMS into a noknok conversation.
Users are rewarded for inviting friends and growing their contact lists with a range of prizes from airtime to movie tickets.
MTN noknok went live on 3 December and currently has thousands of active users.  For the duration of the promotion, which ends on 1 March 2008, MTN customers will only be charged minimum data rates.
The noknok service as well as all off-line message delivery via SMS will be free of charge.