But I think it's a bigger issue and not just about pre-teens and teens.
I think that lying is in some cases a big deal, in some cases a little deal, and in some cases even for the best. I remember lying to get out of some uncomfortable and potentially dangerous situations throughout my life.
For me it's about intent. Do you lie to get something from someone or to hurt someone? That is a big deal to me. Do you lie to, as in the other thread, use Facebook but no one is actually hurt? To me, that's a little deal and other issues (like keeping up with friends) might be a bigger deal. Do you lie to protect yourself, someone else, to spare someone hurt feelings, etc? To me, that's a case where lying might be the best thing to do.
I see it as a more complicated issue than lying being right or wrong. I think it's situational. I also don't like the idea of teaching my kids to blindly conform to rules, and I feel like "never lie" is blind conformance to rules.
I'm wondering how others feel about this and I think it could be an interesting discussion.