The globe is just the favicon of either the website or internet explorer program (or any programs icon that is used to open a shortcut - like the W for word documents indicating it will open in Word program). Are you sure you didn't have a url shortcut to your photos with a different icon previously? it may have been created without you noticing 6 weeks ago and IE has updated/changed it's favicon. Like Google did with its blue and white g.
If you don't want the shortcut just delete it. If it comes back then you will know that whatever/however you downloaded your photos has an inbuilt option to create a desktop shortcut so more details on how you did that download would be needed.
Jock1e's link about the Follow (Twitter) makes sense, could be a combination of both.