To be clear, I'm not saying these things are always a blessing nor are they of the devil, but, like most inventions of humans, they can be used for great good and horrible destruction.
In summary, the Arab world as a whole, lives under the thumb of dictators. It fits easily into their fatalistic view of the world. They also don't share the true Christian belief that all people have tremendous, intrinsic value simply because they are created in God's image. So the tension comes when this basic principal of nature (God's created nature) is violated. Where the common people are seen and treated as "common." Some of the dictators are more benevolent than others. All are corrupt. Some are brutal. But, the main point, is that until now the vast majority of citizens have had no voice. But now, Facebook and Twitter (and blogs) have given them this voice.
I was reading on BBC yesterday that the huge protests in downtown Cairo (I recognize the buildings and can see the university where I studied Arabic) were organized through Facebook. That is really remarkable. I don't know if people realize the power of the net. It really is the net and not Facebook per se, that has the power. If Facebook didn't come onto the scene something like it eventually would have. I predict that all the governments in the Arab world, plus Iran, will either have to drastically become more responsive to the people or they will tumble like in Tunisia.
But of course in each of these countries are a population from 10 to 25 percent who want Sharia (Islamic) law. If those take the power, then great harm could come. They are opportunists and will exploit any revolution.
So how does this relate to Christianity? Everything does one way or the other. In the age of rapid communication the Church has to adapt.