A thoughtful post by Paul Hammond on FOAF etiquette, covers the things you should and shouldn't say about people in your FOAF files.

I think these are pretty similar to the unspoken rules that appear to have evolved into being, I'd add another rule of thumb, keep it simple. If someone's got a FOAF file of their own, they can say as much as they want about themselves, and you only need to keep minimal information about them in your FOAF file and point at their file (rdfs:seeAlso to the rescue).

FOAF how-to's seem to be appearing in a few places, maybe it's indicative of the increasing spread of FOAF.

Talking about a particular specification earlier:

Their specs always look nice and simple at a first glance, then you realise they're just stuffed full of holes, assumptions and incorrect shit...

No names, no packdrill, but this is an all too common event, then again a good specification is non-trivial to write.