12. A computer-implemented method comprising: under control of one or more computer systems configured with executable instructions, receiving, from a user device, an indication of a user interaction, the user interaction including a purchase of a content item of a plurality of content items; determining a rate of abandonment of content items 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 for the content item of the plurality of content items; causing display of the customized questionnaire on the user device based at least in part on the indication, the customized questionnaire to solicit a response to at least one question that is associated with an abandonment of the content item; receiving, via the user device, the response; associating the response with the content item to build or update a user-driven index comprising the plurality of content items; and generating a different customized questionnaire for the content item that includes at least one different question based at least in part on the response, and a recommendation for at least one activity.
12. A computer-implemented method comprising: under control of one or more computer systems configured with executable instructions, receiving, from a user device, an indication of a user interaction, the user interaction including a purchase of a content item of a plurality of content items; determining a rate of abandonment of content items 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 for the content item of the plurality of content items; causing display of the customized questionnaire on the user device based at least in part on the indication, the customized questionnaire to solicit a response to at least one question that is associated with an abandonment of the content item; receiving, via the user device, the response; associating the response with the content item to build or update a user-driven index comprising the plurality of content items; and generating a different customized questionnaire for the content item that includes at least one different question based at least in part on the response, and a recommendation for at least one activity. 14. The computer-implemented method of claim 12 , further comprising: causing display of at least one additional question that assesses an education level or reading level commensurate with at least one of the plurality of content items.