As far as the doxxing somebody goes, Alex found a blog on Tumblr that called him out on shit that he has done. (Much like the tumblr account that exists now.)
He got his panties in a wad over it, because nobody can speak negatively of devpai.
Then, he brought them up in a stream, asking what he should do about it.
Alex left out that in his stream, he called them an “autistic little Bitch.” (Look at him trying to be like the 4channers :') )
He said that “this person deserved to be harmed for what they've done” and “I should send my fanbase after them!”
Then, he proceeded to describe her house.
Then, he took down the stream because of all the hate he was getting for it.
He found out her information from a mutual friend that the blog owner and him both had. The friend either gave Alex their information or Alex asked.
Knowing him, he probably asked like the creep he is.