Okay, Gavin, if you can break, so can I...
The clue photo is not on their Facebook page, but that is where the hunt begins. If you are searching Facebook for a photo of the new bike you won't find it. You have to read the clue and then know what you are searching Facebook for that isn't a picture of the new bike (and be able to recognize it from a thumbnail - unless you want to get popcorn and do their full family history slide show) and then once you find that you should be able to find the real clue...