I think you are looking at it from a technical point of view, and not a "product" point of view.
Adding a tag to something doesn't communicate that you are posting it in a community, nor does it communicate that community's rules, etiquette, morals and values. When a user "tags" something it just means adding a label to it. "Posting" in a community communicates something very different.
Adding a tag to something doesn't communicate that you are posting it in a community, nor does it communicate that community's rules, etiquette, morals and values. When a user "tags" something it just means adding a label to it. "Posting" in a community communicates something very different.