26. The computer-implemented method of claim 1 , wherein the user device includes one or more accelerometers, and further comprising: determining, based at least partly on the indication, that a motion of the user device corresponds to walking, and wherein the different customized questionnaire includes a recommendation for activities associated with walking.
1. A computer-implemented method comprising: under control of one or more computer systems configured with executable instructions, receiving an indication of a user interaction, via a user device, with an electronic book; identifying, from a user profile, an association between a genre of electronic books and content access event (CAE) data, the CAE data including at least one of a particular time of day or a particular location; determining, based at least in part on the indication, an occurrence of an event that is associated with at least a portion of the CAE data; determining a rate of abandonment of electronic books associated with an ambient light intensity that is equal to or below a threshold value; determining, based at least partly on the indication, that a current ambient light intensity received by the user device is at or below the threshold value; generating a customized questionnaire associated with the electronic book that includes at least one question based at least in part on the genre of electronic books, the at least one question including a question associated with an abandonment of the electronic book; sending the customized questionnaire to the user device upon an occurrence of a predetermined event to solicit a response to the at least one question; receiving the response from the user device; associating the response with the electronic book to build or update a user-driven index of a catalog; and generating a different customized questionnaire for the electronic book, the different customized questionnaire including at least one different question based at least in part on the response.