In reply to atticus:
It's obviously a scam, because if Decathlon were doing it it would be under the decathlon.com URL. It's even a fake Facebook page with a fake survey. The Decathlon replies are obviously by someone whose first language isn't English, and even don't look like the linguistic errors a French person would make (noting that Decathlon are French and a lot of their back office is in France).
Even the base URL looks dodgy if you go to it.
Clicked further and you get this URL (don't go to it, or if you do don't enter any details):
https://gift.wtaiworldstar.com/o/HIY7e/?ha_vid=5505e56623e748e29d9c7e076bce...
which is clearly dodgy too. They're harvesting card details, names, addresses etc.
Post edited at 15:15