Sorry, I looked through the FAQ and the rules, but I didn't see an explanation. What does it mean when another member has 'tagged' me in a post ?
It's when you get that little @ symbol in front of your name in someone else's post, @stevesh. <-- Like that. It's a way for the other member to call attention to the fact that you've been made mention. It creates a notification in your notification box, assuming you've not blocked them.