They used to allow people to make "visitor posts" on the Arduino business page and it was 100 times as bad as that group. I tried to help a few people but between the massive number of spammers, the stupidity of the Facebook platform, and the usual difficulties involved in helping panicked beginners I quickly saw it wasn't worth the effort. I think it was a good move for Arduino to disable that feature. Hopefully it pushes people to find the forum instead.
I think this is the last resort for a lot of them.
Social media seems to have the upper hand in the popularity contest and forums as we have seen are just too much work for a lot of people.
Saw a couple of very brave people trying quite hard on a lot of topics with quite good answers but seemed to be overwhelmed by the many who seem to be throwing anything up in the air to see what sticks.
The language differences is something to behold but oddly enough appears to work well.
Dont know why but overall I am reminded of a rugby scrum with occasional adverts thrown in for good measure.
If it was analysed I am sure there would be some good points and suggestions to bring to the forum.
But of course that would mean a major overhaul and fixing things and people from Arduino talking to people in here too. So I guess that would be a pipe dream.
What do you mean by fake? That is a Facebook Group. Groups are kind of like Facebook's version of a forum. Anyone can create one and then people can join the group and post to it or comment on other people's posts. That group is not officially sanctioned by Arduino but I don't think that makes it fake as it doesn't claim to be. I'm not sure whether there are issues with using a trademark for the group name.
Arduino does have an official business page:
Here's an example of a fake Arduino Facebook page: