From Adobe Lightroom's keywords to Flickr's tags

I’ve had Adobe Lightroom for a few months and still I haven’t really mastered even 10% of what it can do, so now I’m on a serious mission to learn about it and use it to publish my photos on flickr, as well as organise my growing collection of photos. This post is about something I’ve just learnt which probably you already know about, or you can google around, so I’m offering this to my friends who I know follow the very few posts I write here and who occasionally use Lightroom and flickr (or not so occasionally).