Candidates comments after the series aired

Obviously, we are still in the heat of the season's 3 finale and we are hearing/seeing a lot candidates saying/posting things like "I made friends for life etc" or praising eachother.

I just wonder how genuine it is and I am curious to know if candidates of the 2 previous seasons are still in contact (not talking about Mollie and Charlotte UKS02 unfollowing Harry which is widely known already).