js solution to... Commentor can only post one comment BUT can reply to their comment tree unlimited
127692
One comment per user per post but be able to reply to existing comments
10373
Can we get rid of the threshold of 15 chars for comments?
19115
Mark a comment as the answer to a question
22721
Is there a syntax for single-line comments for notebooks?
149234
Stop generating "possible duplicate" comments
114749
Allow post editor to see @comments directed at him
45799
Right way to handle obsolete comments when some of them are mine?
23614
A method for the OP to accept comments?
58991
How do I enable comments for user profiles?
90462
Marking comment as an answer?
59454
Use of the comment package
118939
Extend comment "magic links" syntax to allow arbitrary link text
148524
Why does Stack Overflow prevent new users from commenting?
44513
disable comments if array exists
66719
Can we allow moderators to upgrade a comment to an answer?
120358
Show the "add comment" link also to users who cannot add comments
142814
How do you remove the ability for a user to make a comment or post on a page?