A high school fresh graduate was applying to undergraduate schools in the united states. He is a friend of a family acquaintance. Despite the fact that I did not even know his name, I was surprised when the family acquaintance asked me to write a letter of recommendation for him and for his friend. I do not know them at the slightest level. It seems that they were working on a research project, which looks completely silly to me (paranormal research related to the secrets of the pyramids, I did not bother to look carefully). I refused the requests to write the letter of recommendation. In the letter that the student sent me for me to submit, he says I worked with him on various things and I think that he is a genius. This was completely dishonest.
Now, I discovered that the student posted the said project on pyramid secrets (I think it is related to non-sensical theories on generating power from triangular structures) on a website, called academia.edu. In the acknowledgement section, he repeated the same claims that I worked with him on the project. I actually have never talked with him before. Now, I am a graduate student in science. This has been incredibly annoying to me. I wonder what is the best way to proceed. I have sent that person a message on academia.edu but he did not respond. I do not know how to contact him. I tried looking for a way to contact academia.edu to report this dishonest behaviour, but I do not know if there is a way to contact them. Any suggestions will be helpful.