Do Online Resources Belong in Academic Footnotes? (Skinner)

Today while finishing up a review for a monograph (one I really liked, by the way), I wrote the following:

“I also noted at least seven instances where [author] references an online resource or a particular conversation taking place within the blogosphere. This is only the second book I have reviewed in which a number of online resources are cited and I remain ambivalent about the place of such materials in an academic monograph. While it is probably the case that blogs and online discussion boards are here to stay, one wonders whether we have arrived at the place where such materials rise to the level of being included alongside peer-reviewed journals and monographs.”

I am interested to know what our readers think of this. Please share your opinion as I am genuinely looking for a broader perspective on this.