That may have been the case historically, Nic, but since we're no longer considered chattel and actually get to vote, most of us these days tend to prefer equal treatment. :rolleyes:

Besides which it looks rather silly receiving an ebot which says "Karen has added your image to his favourite list..."

Several alternatives which don't require a pronoun:
"Your image was added to favourites by XXX"
"XXX added your image as a favourite"
"Your image was added to XXX's favourite images list"

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire