1. A method performed by one or more data processing apparatus, the method comprising: receiving, by the one or more data processing apparatus, a comment request for a comment to be included in a comments field of a content page; determining, by the one or more data processing apparatus, that the comment will be hidden from users when online content is presented to the users based on a number of other comments presented in the comments field exceeding a threshold number; and modifying, by the one or more data processing apparatus, a position of the comment in relation to positions of the other comments presented in the comments field to increase visibility of the comment to the users, including modifying the position of the comment from a first position that is hidden from the users to a second position that is visible to the users.
1. A method performed by one or more data processing apparatus, the method comprising: receiving, by the one or more data processing apparatus, a comment request for a comment to be included in a comments field of a content page; determining, by the one or more data processing apparatus, that the comment will be hidden from users when online content is presented to the users based on a number of other comments presented in the comments field exceeding a threshold number; and modifying, by the one or more data processing apparatus, a position of the comment in relation to positions of the other comments presented in the comments field to increase visibility of the comment to the users, including modifying the position of the comment from a first position that is hidden from the users to a second position that is visible to the users. 6. The method of claim 1 , wherein determining that the comment will be hidden from users comprises detecting that the comment has low visibility within the comments field.