When did my spouse become DH??

Over the last couple of years I've noticed a trend in online postings, referring to someones husband as DH, meaning Dear Husband. It seems to have caught on almost everywhere I look. Personally, I think this is rather stupid. I also don't see anyone posting "DW", as in Dear Wife. Could it be that these women using this term are stuck in the Leave It To Beaver era? Or is this just some stupid fad that will pass. I don't know, but it irritates the fuck out of me!