There's real momentum behind data portability and that's likely to help all standards. However, I was very disappointed, when we were implementing FOAF, to find

There's real momentum behind data portability and that's likely to help all standards. However, I was very disappointed, when we were implementing FOAF, to find that the FOAF validator is broken. I took that as a sign that people had moved on to other standards (XFN+hcard).