Our garden is about 50m long,about 20m wide, we're a semi and get on well with the neighbours in both sides. The first half or so of the garden borders are made up of tall hedges that have grown up over several decadeds by the look of them, the rest on both sides is chicken wire. Apparently they used to be open at the ends across all three gardens, then people before us had a dog and the neighbours both out up quick fences to stop dog getting into their gardens.
We're now looking at getting rid of the old stuff and putting up proper fencing - lady on R is happy to pay for her side to be done at the same time and we pay for L as that's ours. We're thinking 4ft fence panels. But we really need some privacy - the kids lean over the fences all the time from both sides which is great sometimes, but over the summer hols they were looking in at us having our dinner, always shouting after the dds. And now the chap on one side is building a tree house for their kids... Both neighbours have tall hedges down the outside of their gardens, so have privacy from one side, it's only the sides shared with ours that are wide open.
How can we get a bit of privacy without a) completely blocking their light at the ends, and b) seeming really anti social? I thought of trellis on top of fence so we can still talk through, but would that look odd given the length of the fence concerned? Or possibly a dividing trellis across the garden halfway,that we could grow climbers up, so the far end was still friendly but we had a decent bit of privacy at least on the patio. Don't want to go planting leylandii! 
but perhaps a natural hedge of some sort? We need about 25m of it, whatever it will be.