If you've tried editing the Collaboration System a bit, you may have found that you wanted to add a synopsis to your Collaboration Thread templates.
Now the default synopsis variable (<tmpl_var synopsis>) will work fine, but by default it shows everything in the whole post up to the first newline.
If you emailed in your CS post as plaintext then this means the end of the first line really - works pretty easily and simply. But if you use the Post Thread option instead and add your post then by default it posts the thread as pure HTML which has no newlines anywhere. So the whole article is displayed - kinda crazy if the posts are large.
There's no variables in the post template like there is with the article template for first.100words or first.2sentences or the like, but there is the pagination marker.
The pagination marker (^-;) is a special marker (looks like a macro but it isn't really) which indicates the break point for a synopsis.
When used in an thread post, this indicates an end point for the synopsis - just like a newline would. This means the user can decide where to break the article at any point and you can use the synopsis variable in your CS without it blowing out your page.
REMEMBER though that if you modify your original post, you need to reinsert the macro.
elnino added: I believe this macro was removed in 7.4.*
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