I never follow close, it only takes some granny in front to look in their mirror for the first time in 10 minutes and panic/brake, or some opportunist who fancies a hefty whiplash claim!
I move into the lane next to them, and sit about a cars length behind to their side. If they haven't moved over within 20 seconds or so, I'll wait till there's a gap on the inside lane (escape route!) then blast bast them.
There are some complete morons on the road, they just have no comprehension about what's going on around them. Like on the motorway when they're on the inside lane coming up to a slip road leading onto the motorway. Do they move over to let cars out? no...they sit in that lane oblivious, whilst the cars joining the motorway are piling up behind them!
Rant over...