On iPhone, the menu with reply, pin, delete etc. commands is currently almost unusable.
I can't make the menu show without executing an action:
If you tap on the user name above a comment, the user page is opened.
If you tap on a comment, nothing happens.
If you tap where one of the buttons of this menu would appear, the action is immediately executed.
The only way to reply to a comment is to tap exactly where the (invisible) reply button would be. If I tap the wrong location, I accidentally pin the comment or vote it up or down.
I guess that the action menu should always be visible. All my users seem to create new comments instead of answering existing ones.