... to look up somebody's old threads?
On several occasions in the past I have used the 'Search' tool to look up someone's old threads or past posts.
So often a thread might start with something like "For those of you who know me I've posted about this problem in the past ..." so, if I don't know what they're talking about (and it's an interesting subject) I might search using their Nickname.
Recently, however, I read a post which strongly suggested that searching someone's Nickname was contrary to mumsnet etiquette.
Is there a rule?