Why do people post personal prayers on Facebook?

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I'm not trying to knock anyone for what they do.
But I'm having trouble understanding why some people post personal prayers on Facebook. Is this a new way of connecting to God. I know social media is a network but do God really answer prayers via facebook? I see it just the same as praying to God but kneeling to a golden calf first.

I see if they post words of encouragements, post a few scriptures of hope, and letting people know they are praying for them, but to quote your actual personal prayer. Do they pray to God in secret first and then post it on facebook? Also I don't understand why a lot of them cry out to God on facebook? Is it really sincere and truthful or a public exhibition?

Thanks