I think this is an interesting and relevant topic. Does the steem blockchain have a place to post metadata when creating a post? Or was this the proposal, that Metadata be added?

The most elegant method would be room to bake in metadata into a post, but in reality we can already do this through regular text will be the future of 2nd layer formating and filtering on the steem chain (e.g. Markdown currently used as the open source formating language/style sheet across steem). This will become increasingly true as use expands into the other web interfaces to the chain (like i'm using chainbb right now).

For certain types of communities to grow on steem, stronger curation tools are needed. Different types of flagging will allow for creativity in formating. Sites that want to use second layer moderation already have the tools available to them: This can be achieved he same way as metadata for filtering/formating a post, only inserted by a moderator as a reply to a post.