blogging ambiguity

My friends don't much like reading the blog.  I find this fascinating and reassuring in some way.  I think it's because they know as well as I that I'm not putting "out there" a lot of what I'd actually like to say.  A big part of the discomfort, if you ask me, is audience.  Just who is the audience, and do I write the same for my multiple audiences?  What would a blog have to look like that my family, students, friends (and strangers) would equally find of interest?  (And should I write only in English?)  You know what is the only common point of convergence?  RECIPES.  That's really about the only discursive realm that I feel comfortable posting publicly (and all of those have been "boosted" from other written sources).  Logs, by nature, are private, are they not?  In putting a few of the Alberto Salazar photos on the side bar I saw a way that I might be able to create a research-focused web log to which primarily I would have access and that might help me put into order what is now a buried mess.  I told one of my friends this morning who expressed her less than enthusiastic reaction to my blog that I react similarly to getting "holiday letters" from people, those "written-to-one-and-all" summaries of a year's familial activities.  As I told her, as much as I love (and even look forward to) receiving these from most people and seeing the photos now almost always included, receiving one from a good friend throws me for a loop.  To whom exactly is she writing (and she's usually a she, although I will forever miss the ones from Larry Crosby)?  Where's the special voice to which I believe I can lay claim?  Is this belief false?  Where do I stand in the queue?  Have we replaced/reduced/condensed the women's "kin work" associated with holiday cards and gifts with the generic holiday letter and these blog things?