Plough,
On twitter.
"I posted a new photo to Facebook"
Photo = 1
a = 1
nothing about photos some or slideshow....
a new photo - not - but new to facebook, and a strange one to post at that.
The slide-show as you suggest are the past photos that have been posted in the album.
Strange that 1 photo has only been posted recently and it was this one, not the gold pour. then to post the above on twitter.
cheers,