Determining whether a user has
US20150178281A1 Patents
Embodiments of the invention determine whether a user has seen a content item based on at least two factors: a measure of
18 claims. 38,352 characters of text.
US20150178281A1 Patents
Embodiments of the invention determine whether a user has seen a content item based on at least two factors: a measure of
18 claims. 38,352 characters of text.