If a picture of a person wearing a safer shirt gets a lot of likes, that means a lot of people are looking at it. Not just the people who are clicking "like" but lots of other people too. If something has a lot of likes, Instagram assumes that it should be presented to a lot of people. If it gets presented to a lot of people, then there is a good chance it will get a lot of likes.
It is a phenomenon that kind of feeds off of itself. Internet viral popularity!
thank you for all of the help getting the safer message presented to a lot of people!
Remember if anyone disagrees with your safer shirt tell them to read the safer book!
Link to the safer book remember the Bitly: Bit.ly/saferbook2