A threaded inline message board is a type of online discussion forum designed to streamline conversations by nesting replies directly under the original message. This structured format allows participants to easily follow and engage in conversations, as the responses are visually connected to the initial post, often with indentation or another clear marking.

To effectively identify which threaded inline message board you are referring to, consider the following:
Platform-specific features: Some platforms have unique features such as customizable profiles, user rankings, or specific moderation tools. Think about any distinctive elements you’ve noticed.
User Interface: Look at the layout and design. Some message boards have a more modern UI, while others might look dated. Specific color schemes or stylistic choices might give a clue.
Community Culture: The tone and types of discussions can sometimes point toward specific communities or websites. Is the atmosphere formal, casual, tech-oriented, or niche-specialized?
Technical Aspects: Does the board support rich text formatting, multimedia integration, or specific coding languages? How is the search functionality?
Historical Context: Some platforms have been around for decades, evolving from earlier web technologies, while others are newer entrants leveraging current web standards.

Without more specific details, there are several known platforms that use this style. Well-known examples include Reddit, where each comment can be threaded under a post and responses are nested under each comment. Other forums might use software like Discourse, NodeBB, or vBulletin, each supporting threaded message formats.

Ultimately, identifying the message board could require further context, such as specific features, the community served, or design elements that are unique to that platform.