Guys be careful off @persona-nongrata
I don't know for sure, but he messaged me and in the end he asked for my age, I told him my age and asked him for his. He said 26, he didn't say anything else but he didn't block me either. I blocked him to be sure. I'm pretty sure that he found my account through this side of Tumblr.
So possibly a creep, but to be honest I'm not completely sure.