I did the whole frontend (some backend for #identica). HTML, CSS, and no JavaScript.
I take pride in that work b/c it was technically the "state of the art".
Progressively enhanced; valid markup, alternate stylesheets, and a tonne of structured data directly from the webpages. Essentially enabling a read API.
Something for the #microformats fans:
https://microformats.org/discuss/mail/microformats-discuss/2009-February/012821.html
https://microformats.org/discuss/mail/microformats-discuss/2009-February/012822.html
>the best implementations of microformats in a social
media site