Read that. I'm not sure how you came to your conclusion that it was a fake. The story you posted jumps from point to point and shows nothing that cohesive.
The creation of a new Twitter and Facebook page right before the actions does not surprise me. He seemed to be out for media attention.
I read another story that for the past 3 years, according to a journal he kept, he pretended to play World of Warcraft obsessively as a cover for his planning and training.
There were several points made. I do not fully agree with the author,,but there are some points.
The guy was fiercely nationalistic. A Neo-Nazi from his prior writings. Nordic Pride.
The Facebook page was done entirely English with no reference to such and included American centric writings and media.
It was recently created, along with a twitter account with ONE tweet in English.
The alleged "manifesto" was reportedly sent to Facebook friends.
There were NO Facebook friends.
Add that the Photos being circulated look fishy.
This is a deliberately released persona.
Now as to other"issues",, I started watching this when it was first posted here as breaking news. I tuned into a live feed from the area.
There have been several videos of the scene you can watch,, I was watching live.
The first thing that struck be was the lack of any response. Not a single cop,,not a patrol car that came to the area of the blast.
I was watching for some time as both citizens and media showed up and wandered the scene, then sirens could be heard in the distance and eventually folks started to show up.
It was later that I heard that Oslo had just had Terrorism drills,,days before. The lack of response was curious.
As I was watching this the first reports of shooting came up. I posted that here at the time.
I was following the story looking for any information.
It was 90 minutes from the report of shooting till the cops crossed a narrow stretch of water to stop the shooter.
Again the lack of response was glaring.
There was either massive horrible incompetence,, or a deliberate non-response.
From what I am seeing, I suspect the later.
I have come to believe this whole event was deliberately staged.
As to the "Why",?
Not sure yet, but I believe and expanded "War on terror" should be expected.
It is possible that TPTB see a threat from the growing Nationalist movements in Europe, and a threat to the EU. Perhaps this is meant to neutralize that.