Final answer:
The '8th category' of social media is not officially defined, but it might be considered as anonymous social media platforms like Whisper and Yik Yak. These platforms allow users to share content anonymously, influencing both positive discourse and negative behavior.
Step-by-step explanation:
When categorizing types of social media, it's important to recognize that there is not a universally accepted singular '8th category'. The types mentioned, such as social networking, bookmarking, social news, media sharing, microblogging, and online forum sites cover a broad range of social media platforms. However, based on the types listed by Dollarhide and Drury, we could consider an 8th category to be anonymous social media.
Anonymous social media platforms allow users to interact without revealing their true identities, which has both positive and negative implications. These kinds of platforms can encourage free expression and provide a safe space for sensitive or controversial discussions, but they can also lead to increases in threats and abuse, as anonymity can sometimes embolden harmful behaviors. Examples of anonymous social media would include apps like Whisper and Yik Yak. It's crucial to note that understanding the impact and categorization of social media is an ongoing process, reflecting the rapid evolution of the field.