1. A system comprising: one or more processors configurable to cause: displaying content items in a web browser, each content item having content displayed according to one or more formatting tags; identifying a first one of the displayed content items having first content displayed according to at least a first formatting tag, the first content item having dimensions comprising a height and a width; identifying access credentials for accessing one or more content posting services, the access credentials comprising a user name and a first network address; accessing the one or more content posting services using the access credentials; processing publication information associated with the one or more content posting services, the publication information comprising an identifier and a second network address; determining that the second network address of the publication information matches the first network address of the access credentials; selecting, responsive to determining that the second network address matches the first network address, the identifier of the publication information; generating a post including the first content item according to: the selected identifier, and the dimensions; displaying the post in a preview interface, the preview interface enabling: user entry, user modification and user deletion of content in the post including the first content item, and user selection of each of the one or more content posting services; and providing the post for posting on the one or more content posting services.