I have recently updated a lot of the board software. One of the new "features" is the ability to add hyper-tags to content to improve search functionality. Currently I allow everyone to do so, though it is by no means required (the baseline search engine does a decent job with standard text searches) however it might be of benefit on posts that don't have a lot of text - for example photos or illustrations. You might, for example, take some photos in the mountains, and want to add search links like ponderosa, yamadori, etc, without having to write a long text description. It is similar to the functionality in Wikipedia, and can be used for both "good" and "evil". I can always turn it off if it becomes too much of a distraction.