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Level 3
It is your choice if you wish to make your email address public in your community profile. That choice does exist, but you risk getting spam and are unlikely to get messages from fellow players that way. There is no chat function in the game and also there is no means to chat privately here in the community, it has to be via one of the threads. Private chat is discouraged I believe because it would be too easy to exchange really useful tips on how to beat the game.
I have a Candy Crush "friend" who sends me loads of lives - I don't know why or how, as the bulk life-sending system has disappeared for me and I rarely ask for lives. I found that I can send a life in return by clicking on my profile picture, then 'friends', then find that player to send a life. It's a bit inconvenient and not really a "connection" but I'm happy to send a small personal thank-you to that player!