You should always share your photo blogs unless you want to keep them completely private to yourself. By sharing them, you are giving others the ability to view them online.

You can share any photo blog by setting the photo blog's "Share With" controls. To share many blogs at once, change the share settings for an entire photo blog folder -- then all the blogs within that folder will have the same share settings.

If your photo blogs aren't too private, you can most easily share them by clicking on the "Public" for Groups:

Then not only your named friends but the whole world-wide web can view your photo blog.

"Public" share group mean that your blog will be shared with the public in just the same way any public web site is - it can be accessed by the general public.

Be sure to include at least a moderate amount of text in your photo blogs so search engines like Google can find your pictures by indexing the words in your captions (search engines can't index your photos, but they can index the text in your public shares). In general, the more text and the more specific and accurate the text is, the better for the search engines to direct interested viewers to your content.