Abstract: In order to build or aggregate lists of potential customers, contact information may be collected from viewers of a document, such as a presentation. In particular, multiple pages in a document associated with a user of a social network (such as slides in a presentation) may be presented to a second user of the social network. At one or more dynamically selected pages or locations in the document and/or a dynamically selected position or location on a page, the second user may be requested to provide their contact information and/or additional information. Moreover, the contact information needed from the second user may be dynamically determined.