Final answer:
The question asked for a percentage of teens who sent a sext electronically, but the provided reference information does not contain relevant data to answer this question.
Step-by-step explanation:
The question pertains to a study of social media use among teenagers regarding the sending of 'sext' photos. Statistics from a survey or study are needed to answer such a question. Unfortunately, the provided reference information does not include data about teens sending sext photos electronically. Therefore, based on the available information, it is not possible to provide the percentage of teens who have sent a sext electronically. Without specific data related to this inquiry, it is professionally responsible to refrain from attempting to answer the question.