If you are doing the right things you don't need to ask anyone to start a conversation. They just will.
Far too many times you see businesses saying - Like this, Post that or Tag here.
It is far easier to ask for someone to start a conversation then just be a conversation.
Just being a conversation means ultimate products/services, seamless customer on-boarding or delivery, excellent customer service and response together with all the other myriad parts that make great companies great.
Be the conversation by being excellent and you won't have to ask for someone to start a conversation ever.