Apparently everyone blogs now. I assume many blog for the same reason I do - to keep track of articles and events without printing off paper and filling filing cabinets. Celebrities also blog - even the dumb ones (subjective opinion about the fact they are dumb or that there are dumb ones, but they are by virtue of what the majorty believe). I do not find very many world leaders blogging. I could only imagine a Bush blog - full of howdy do's and whatchamacallits and other blather. Brown - well, who knows, a few cheerio's and rights and that would be about all he could muster.
On the other hand, Mahmoud Amindinejad has his own blog, and he updates it occasionally. It seems that the overwhelming response from the world public is in favor or neutral. Only a few wish him ill health - usually Americans.