Jonathan Powell has already joined Facebook, so you should do so as well.
Why? My immense respect and admiration for Jonathan Powell does not and need not encourage me to join Facebook if - as is the case (as I've already made clear) - I simply have no desire to do so and cannot see the point of doing so. Why would Mr Powell's membership of Facebook mean that I "should" join it myself? Just curious! In my curiosity, however, I cannot say that I take especially kindly to being told (particulary by someone whom I do not even know personall), that I should or should not do something or other, frankly - for what that may or may not be worth...
Should it be assumed that you are on Facebook yourself, then?
Best,
Alistair