Miss Murray, I really would advise most strongly against sharing this with your class.
One of the things that has been extensively discussed on this thread is the ethics of a teacher making public their private thoughts about pupils. You've said some things about your school and the children you teach that really aren't appropriate for current pupils to be privy to.
At sixteen/seventeen they just aren't mature enough to see any of the wider picture other than their Sociology teacher thinks that some of them are annoying, knows that many of them have experienced trauma, believes lots are highly sexualised etc. And even if they are very mature, current pupils should still be treated in adherence with safegarding guidelines around privacy, dignity and respect, which means as a very baseline, not discussing them on the internet (and even if you're talking about previous pupils, bright current pupils will connect that these are thoughts that you have generally, including about them).
Your school will certainly have a social media policy that you signed with your contract, in which you agreed to be circumspect about what you say in general about education - and to say nothing at all about the school and its pupils - and employ high privacy measures in your personal online interactions. Mumsnet is social media, and I think that what you've said on this thread has absolutely breached this policy if you are identified.
Anonymous comments by teachers on here are fine (though be careful to nanchange often and avoid anything identifiable), but you are proposing to share the link to this thread with your class. And even if you don't share the link but just reference the fact that you took part in a discussion on here about the Kate Clanchy debate, it is the matter of moments for them to Google and find the thread (and I'm assuming Miss Murray is your real name, so it wouldn't be remotely difficult to work out which posts are yours, even without the details of your subject, the deal you had your class and the boy who is "cranky and conservative in his views" in particular).
I implore you to say nothing of this to your Year 12 class, and given that you've already had some conversations with them about your plans to post here about this issue, I would urgently ask Mumsnet to delete your comments.