Tag Spam means using irrelevant tags, especially popular tags. Using tags improperly makes it hard to find good and relevant content.
Please use relevant tags when posting! Abusing tags can potentially lead to people flagging you, even from dan himself.
Additions for Specific Tags
Please refrain from using #photography for posting art, posting graphics, posting other users photos without commentary, etc.
The introduceyourself tag is for creating a post that tells us about you. Users are encouraged to use this tag exclusively for that, and not to reuse it.
Please only use the steemit tag for articles distinctly related to steemit itself.
How are tags useful for readers?
Tags are useful for readers because they will search specific topics like "photography" which is a popular tag. If everyone posts in photography even if their post has nothing to do with photography, but just because it's popular, eventually the photography tag will be useless to anyone who is actually looking for photography related posts.