the new word of mouth

according to wordspy:

word of blog n. Communication that occurs via blogs. [Cf. word of mouth.]

Example Citation:
Just like the Web itself, blogs — more than 70 million by one count — have moved from their pioneer days to a more mature phase where they command respect and huge mainstream followings.
Gillin argues that, rather than adding up to a vast wasteland, the addition of each new blogger improves the quality of discourse.

No longer will 30-second TV ads reach the right audiences. "Word of blog" is the new word of mouth.
—Dean Takahashi, "For new breed, word of blog becomes new word of mouth," The Seattle Times, May 21, 2007