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once logged in the tag a friend on this photo function is missing. the text (in german: auf diesem foto) is visible but the button or tag function doesn´t appear.
I was seen your website, i was tried to upload a new photo and its look fine overall.. in your backend, i saw phoca gallery component. maybe your "tag this photo" button doesn't appear because you open a photo on phoca gallery component not in jomsocial component..
if my answer not clear for you, please let me know :)
NB : I did not delete the photos I uploaded so you can check this issue again.