A spokesblogger is a spokesman for a government official, company or non-profit entity who also develops, writes and edits that organizations blog. By nature, the spokesblogger does not speak for themselves, but rather, on behalf of their employer or the organization that they represent.
Etymology of "spokesblogger"
One of the first known uses of the term was on Ditherati. In the Internet mailing lists's February 7, 2005 edition, it described Robert Scoble, then employed at Microsoft, as a "spokesblogger."
References
Spokesblogger Wikipedia(Text) CC BY-SA