In what ways does social media actually diminish connections between people?

Today, it is easier than ever to connect with friends or family at any time of day.  However, some would argue that rather than increasing intimacy, the internet is causing our relationships to suffer.  In what ways does social media actually diminish connections between people?
HINT:  In terms of structure, this is a cause and effect essay:  social media causes diminished connections.  You may consider relationships between people, our overall connection as a society, or both.