The guest system is not a feature anymore on the site, however your friends can still easily make an account that will allow them to leave comments on yours and other user's journals.
It is quick, easy and free to do - just simply ask them to visit this link and enter their details.
One thing to keep in mind is that some users who do not post images, sometimes have a small sentence on their profile description that states that they are just on blip to enjoy the photography. This often helps other users understand why the person is commenting but not posting images.
Being un able to share a photo with a Guest is very disappointing and a lost opportunity for marketing Blifoto . I had some success geting new members by sharing a photo and hence the link.
Thanks for information
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