It was a bit strange for me too, because Michael's twitter and facebook posted it yesterday and they do post such things often, like - photo of the day- and all, it's not the first time, but yesterday Sony Music Global also posted the same thing (they follow Michael's twitter and they saw it)
Sony Music Global
What an entrance! Check out this great photo of @michaeljackson from the HIStory tour: http://bit.ly/rdYIF8
about 24 hours ago via HootSuite
I follow Sony Music Global and they don't always say something about the photos that Michael's twitter sometimes posts. Actually since I follow them they never have. It was like last time when they had Bad with "I'm back!" and Michael's facebook & twitter posted a photo from Bad. I don't know, it can be that being Michael/Sony they sometimes post the same thing, and maybe they liked the photo. They don't usually re-post all Michael's page messages.