Currently, atom values are opaque. Formatting syntax in the text of atoms has been avoided, as it makes special logic for display necessary, and complicates automated analysis of text.
However, certain wiki syntax would be very useful, such as [internal links][7cYd8xt] and external links.
Brain-mode already uses wiki-style bulleted, indented lists. Certain markup such as font face and color might clash with Brain-mode's use of fonts to encode information about an atom, but would be useful in creating content for the Web. Existing tools such as Markdown Mode could be used for rendering.