Communication and Messaging (correspondingly would be slightly adjusted as) Social Software is related to use of messaging app which is Very close to one of the categories listed below. Technology & Programming however best fits.

This channel is a communication platform and provides the latest info on BinaryX. Please follow the rules. Spreading rumors, and shorting are prohibited. Pornograpy is prohibited. No hatred speech, promotions, spam, or bullying. No racism.

Web & Communication

List he had only lists general categories. However, the word "ROOMCHAT" in all caps in the title could imply a certain categorization of the chat, possibly linking to a category involving communication or 'Actual usage' of a platform that includes chat functionality.