From other crypto blockchain platforms rule of thumb is normal use tags to your content,
the #blurt tag would be for updates about the platform, information, projects, knowledge that is about the platform.
#introduceyourself is when your do your intro post.
It would depend on the community or creator of the tag, normally rule of thumb is use tags what your post is about, people don't usually mind as long as the tag and content a line, than just using high ranking tags.