Help me pick a blog or social network site

I’m not a member of any social network sites and really don’t want to be, but I’d like to have a blog that only my family can view. However, most of my family don’t use social networking sites either so I’m really looking for a site that just asks for a password to view my blog and doesn’t make them sign up for an account.

I’d also like it to be friendly to posting text and pics from my iPhone. I can probably do that with any site, but the friendlier the better.

Wordpress.com is my favorite.