Looking for a free dataset of Japanese text/speech with speaker/writer gender

Hi, I’m looking for a dataset that will contain either social network messages in Japanese (Facebook would be good and I think it includes gender info) or transcribed natural speech with the speaker’s gender data. I did quite a lot of Googling in English and couldn’t find anything and my Japanese is not good enough to be able to search on Japanese pages, maybe someone with a better command of Japanese could do a quick search for me?