Matthew Yglesias is all about the vlogging.
Kevin Drum isn't, because text is easier to scan and easier to link in".
Demosthenes would like to point out that vlogging isn't really an option for some of us. That whole "nobody knows you're a dog" thing is way harder to pull off when everybody can see your muzzle and paws.
That said, I do think there's a happy medium of using video footage to supplement text.