Colleague blogging about co- workers

I just found out that a consultant in my workplace has blogged and tweeted about me and other co-workers. He is using his own name to blog and tweet and he is doing it in work. The content posted is negative in nature. Not personal, mainly this guy blowing off steam about our perceived shortcomings. He is very technical but has absolutely no people skills. The internal team is trying to get up to speed in his area of expertise. We are meant to learn from him but he doesn’t speak to any of the team unless he has to. He just speaks to our boss and the bosses boss. He acts differently around them and they excuse his bad manners, distance and gruffness because he is an expert t in his area. He is not using names in his blog posts but it’s obvious who he is referring to. I have made unofficial complaints about the guy before but got fobbed off by the boss who said the guy is foreign and maybe it’s a cultural thing and that it's hard for him in a strange country etc. That to me is a load of bull. We have lots of other nationalities in my workplace and they integrate very well.


I have told some of the other people who were blogged about and none of them are happy. We are not sure how to approach this. My blood is boiling. I had to calm myself and not barge in to my boss’s office. I want him dealt with but I’m not sure how to approach it. Any suggestions welcome.