As previously discussed in: Proposed tag synonyms for [dnd4.0] we have a significant SEO problem stemming from our use of (semi-) standard abbreviations for RPG names in tags. This is exacerbated by tags not taking special characters and having a 25 character limit.
In the normal SEs, this isn't so much of a problem because [perl], [python], even [windows-server-2008] are short and you can just use them in the tag.
However, common game names in the RPG world are "Dungeons & Dragons Fourth Edition", "Dungeons & Dragons Essentials", "Mutants & Masterminds Second Edition", and similar. Normally, we'd abbreviate those things like "D&D 4e" but the resulting tags are resulting in poor SEO.
So what do we use?
[dnd4.0] was bad because there was no implicit space between dnd and 4.0.
[dnd-4.0] is somewhat better. But the dnd isn't quite "D&D". And what if they are searching on "Dungeons & Dragons?" Do we tag everything multiple times for SEO reasons? [dungeons-and-dragons-4e] might be better, but these forms start going over the 25 character tag limit. [dungeons-and-dragons-essentials] isn't possible. And again, what about searches on "D&D" now? We can NOT have it be the community's job to be retagging every single post with multiple tags to make it more SEO friendly.
Things that could help this a little. 1. Allow special characters (& especially) in tags. [d&d-4e] would help. 2. Let the tag field be a bit bigger, so things like [dungeons-and-dragons-essentials] fit. 40 characters maybe.
The real solution. More advanced functionality where synonyms, perhaps drawn from the tag wiki, are inserted for SEO purposes. Let's say we tag with "[dnd4]" for brevity. If there were a way to configure "hey, that should map to 'D&D 4e' and 'Dungeons & Dragons Fourth Edition' in the tag wikis or synonym screens, and then SE should insert those expanded values into the page (optionally, just for search engines).