14. A method for providing contextual advertisements presented to a user in association with electronic books, the method comprising: receiving information to be included in a contextual advertisement for presentation to the user, wherein the contextual advertisement is presented to the user in association with an electronic book; identifying the electronic book including a plurality of pages; identifying content associated with each one of the plurality of pages; based on content of a target page of the plurality of pages and content of one or more pages preceding the target page, generating the contextual advertisement; determining, utilizing a first computing process, whether the contextual advertisement includes content associated with one or more pages subsequent to the target page; based upon a determination that the contextual advertisement does not include content associated with one or more pages subsequent to the target page, presenting the contextual advertisement to the user; based upon a determination that the contextual advertisement does include content associated with one or more pages subsequent to the target page, generating an updated contextual advertisement; and presenting the updated contextual advertisement to the user, wherein the first computing process is performed by one or more computing devices.
14. A method for providing contextual advertisements presented to a user in association with electronic books, the method comprising: receiving information to be included in a contextual advertisement for presentation to the user, wherein the contextual advertisement is presented to the user in association with an electronic book; identifying the electronic book including a plurality of pages; identifying content associated with each one of the plurality of pages; based on content of a target page of the plurality of pages and content of one or more pages preceding the target page, generating the contextual advertisement; determining, utilizing a first computing process, whether the contextual advertisement includes content associated with one or more pages subsequent to the target page; based upon a determination that the contextual advertisement does not include content associated with one or more pages subsequent to the target page, presenting the contextual advertisement to the user; based upon a determination that the contextual advertisement does include content associated with one or more pages subsequent to the target page, generating an updated contextual advertisement; and presenting the updated contextual advertisement to the user, wherein the first computing process is performed by one or more computing devices. 18. The method of claim 14 , further comprising: determining whether the updated contextual advertisement includes content associated with the one or more pages subsequent to the target page; and upon determining that the updated contextual advertisement does not include content associated with the one or more pages subsequent to the target page, presenting the updated contextual advertisement to the user.