I belong to an on-line group of biblioholics and over the years we've talked about many books. One book we read was Judas Child by Carol O'Connell, a very dark mystery/thriller. I didn't usually read those, but boy was I glad I did! Since then, O'Connell's Mallory series has been a particular favorite of mine (and we know what happened when the newest was released).
A couple of us are discussing the book on the site and one person left me a private message with a few queries. One pertained to Winter House, the book before this one, while the others were about this new adventure. I didn't know how much to say, because some people don't like spoilers. I did ask why she hadn't posted these questions on the main thread. Her response? "I didn't post this on the regular thread because I don't like spoilers and if someone else hadn't read about the proposal yet, who was I to ruin it?" (OOPS! - Spoiler for Winter House!)
Here's the thing. In my mind, if you're not keeping up with the series, don't read any discussion of a new book or of the author. If you don't know that Dumbledore died at the end of Harry Potter 6, stay away from discussions of Book 7. Simple as that. If we're both reading Book 7, come July, then tell me that you're only up to page 50 and not to spoil things. But to have me keep quiet about past books? Somehow, that's not quite the same.