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Within book clubs and communities you'll find the ability to participate in discussions. There will be a discussion thread box on the page like this:
It shows the various discussion threads created, and you can click through to each to read them and post your own comments.
In the discussion threads box you'll see the usual Connections 'add' icon, which you should click to create a new thread. Enter the title of the discussion thread when prompted by the pop-up:
When you've entered the title and created the thread, you'll be taken to the thread itself to post the first message.
Once you have opened a discussion thread, you can read all the posts within it, or add a new message by entering it in the text box at the bottom:
When you create or post in a discussion thread, you automatically follow it, so will see alerts in your 'My Following' box when other users reply.
Please note: if anyone replies to any of your messages, you will see a notification on your profile page saying “New replies (X)” where X is a number of replies. When you click on it, you can see to which messages of yours the reply was made: