The social customer service market comprises applications that support social media as a component of an overall customer service strategy. Gartner classifies an application provider as a social customer service vendor if it supports customer service in one or two specific types of function: External communities: Often referred to as peer-to-peer communities, this software enables customers and partners to blog, post, rate products/services and construct ideas, as well as support peer interactions and offer incentives for loyalty. Social media engagement: Going beyond just monitoring social media for brand mentions, these applications are capable of responding to constituents on popular social networks and have case management.