Our friends over at History News Network in the States ask themselves and their readers this challenging question, and come up with an answer History Today can agree with:-
In the fast-paced world in which we now live, public attention is focused on issues for ever briefer periods of time. If scholars want their analyses to be taken into consideration--and why shouldn't they?--they have to jump into the debate early and with forcefulness.
...what is a blog? It is nothing more than an old fashioned common-place journal in a new setting. It gives the reader the chance to look over the shoulder of a historian who's reacting daily to events.
...slowly over time as readers provide more and more feedback--readers like you!--we will get a better sense of what should appear in a blog written by a historian and what should not.