But if it is the form of a Blog for general consumption the person has the option of not reading the contents and harassment would be difficult to prove.
But the person wouldn't know they were about to be harassed until they'd read the blog, in which case it would be too late.
Reading just one or two entries would probably be sufficient to give the person an idea of what is on the cards and then they decide whether they want to read more or not. Harassment is continuous, in the face action where the affected person has little or no chance to escape. Each case would depend on the evidence presented at the time, and would probably only result in an injunction being served on the offender.
My own view would be that any person setting up a blog to harass someone, in full knowledge of the current legal spotlight upon such matters locally, would almost certainly face criminal charges when they are tracked down. I certainly wouldn't like to be in the shoes of someone running such a blog at the moment and I sincerely hope that no forum member is involved in such a thing.
In the past, there have been various moans on here about why certain conduct, behaviour or activities are not permitted on the Forum. The recent furore will well illustrate why we have always had firm rules, that are to the benefit of all members.