Attend a conference and what you you find? Paper, paper everywhere! Flyers handed at the entrance, stuffed in your conference bag, on exhibition tables. The solution: make signs that people can photograph. Of course, your message should be interesting enough that people will want to take pictures.
I did print out this flyer but what did I find? Attendees were taking pictures of my poster because they wanted an electronic version, not my paper flyer.
I was so happy that they wanted a permanent copy on their smartphone.
I now have many undistributed copies of my flyer. I have learned my lesson.
I did direct participants to take pictures of my writing tips. I was glad that I DID NOT make printouts of those!