@Candide Thanks for sharing this here on the forum - you beat us to it as this was ready to be shared here in the forum today. It’s simply a fun competition to celebrate the fact that the TrustedHousesitters Instagram feed has reached a fabulous milestone of 100,000 followers 
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Anyone can get involved but you do of course need an Instagram account and will need to be following the “trustedhousesitters” account to be able to enter the competition.
You can find more information here:
Have you entered? Good luck if you have 
@Twitcher There’s only one person who needs to give an email address - and that’s the winner 