@mfeilner Was it really a social networking platform? I'd only use that term if it reifies relationships between people and groups. I'd call a chat system "social software".
@mfeilner I think "social media" is an even finer distinction! I would only use it for the creation of media objects (text, images, video, audio) and distribution through social networks. So, definitely not a chat system -- where the media objects are ephemeral.