I started playing with websites from the moment my (now defunct) dial up provider offered me 5 megabytes of web space, and I dived into blogging at about the time that Dave Winer first decided Frontier 5 could be more than an alternative script for Apple Computers and positioned it as a blog publishing tool. (I moved to Movable Type in 2003 and have never looked back). I have consistently, if intermittently, written a blog (or two) ever since, but the thing that nearly killed off my blogging habit was Facebook.
Facebook has a number of inherent advantages over a blog. First of all, it is designed primarily as a means to keep in touch with people one already knows and likes, so it have an important function apart from the kind of exchange of information for which a blog exists. Secondly, people actually read and comment upon and sometimes care about what you write on Facebook, and because they are already your friends, they are generally supportive. The blogosphere, by contrast, unless one is on the so-called "A-list" or even on the "D-list", can be kind of a cold and lonely place, one in which one is essentially shouting in the vacuum with no one to hear. This is not all a bad thing, and can actually be quite therapeutic, but it is a different experience from Facebook.
Another thing that Facebook does well is it pulls people together, at least superficially, into groups of common interest. One of the most encouraging Facebook groups I have joined is entitled "On est Juifs et on est Musulmans et on s'aime. (OJMA)." In one sense, such a group may reflect no more than a naive one-worldism that overlooks the serious rifts that exist among adherents of the three Abrahamic religions. I prefer, however, to think of the group as an expression of hope that hatred can be overcome, particular in a region -- the so-called Holy Land -- that is rife with hatred even as it purports to be a center of peace and love. This group, to which I was referred by Tunisian blogger Massir Destin, appears to be comprised largely of francophone North Africans, who have a remarkable tradition of religious tolerance stretching back even before the establishment of the legendary kingdoms of El Andalus in what is now southern Spain. This not to say that the region is without bigotry, but it has a remarkable historical record of largely not eviscerating people over religious differences. So-called Christian Europe, with its shameful record of persecution, pogroms, and ultimately the Holocaust, should take note. Suffice it to say that with number of close Muslim friends and a Jewish family, this cause comes close to home.
Finally, however, I come full circle. Because for all the virtues that have led to its explosive growth, there are a number of areas where Facebook falls short of the blogosphere. First, Facebook may be liberal, but it is not free. In the benevolent dictatorship of Facebook, the company can always shut you down. Breastfeeding mothers found that out in a hurry. True, the various companies that host blogs are also able to impose some restrictions, but one can always move, and, even, in a pinch host one's blog onself, so long as one has a computer and a high speed connection. Facebook, in contrast, has far more control over both content and its distribution than anyone has over a blog. Second, Facebook is geared toward people one knows already, functioning more sometimes as an echo chamber than a true exchange of information. Third, Facebook takes only limited advantage of the possibilities for linking information offered by the full web and the blogosphere. Finally, Facebook has an audience limited to one's "friends"; the audience in the blogosphere is potentially limited only by the number of users on the web and the efficiency of Google.