Personally speaking, from my interpretation of all blue flag type rules is that if you get a blue flag it DOES NOT mean you have to pull over IMMEDIATELY and let the person behind you pass.
There are many racers out there who will abuse you and carry on like a pork chop spamming the text msgs with things like BLUE FLAG MOVE OVER etc etc when they think they are close enough.
If I get a blue flag and I am approaching, or in the middle of, a corner or a chicane I dont immediately move over as this is quite silly and dangerous as I could spin and end up crashing. I wait until it is safe to do so (like on a straight).
The other thing is, blue flag does not mean surrender your position which a lot of people seem to think it means. If I am in the middle of a race and I get a blue flag from the position behind me, I will not surrender that position without a fight. If I did, why bother even racing? If they end up passing me, well done, good pass, on we go. If I was a lapped competitor, well thats different, and I will move over when safe to do so. Often I will take a line off the normal racing line if I am slower and I know the faster cars are coming even before the blue flag appears (by checking mirrors) so they can get around me fairly quickly.
In real racing there are TWO blue flags. When held stationary it means there is a car close to you, when waved, it means somewhen is attempting to overtake you. I can't remember the bit where it says "when you get a blue flag - get the hell off the track NOOB"