"Someone just told me I should allow comments. I didn't even know you could, but found this: [To] share your thoughts about a friend's photos. . . you'll need a Google Account for Picasa Web Albums. Once you're signed in, follow these steps: 1. Select a photo. 2. Write your comment in the text box that appears under the photo. 3. Click the box next to 'Subscribe' to receive an email notification when someone else comments on the photo thread. 4. Click Post Comment."