Here is an example summary of this reading selection:

In “Alone Together: Why We Expect More from Technology and Less from Each Other,” Turkle describes how, as technology increasingly makes it easier for humans to communicate electronically, people rely increasingly on their electronic devices to communicate, even while in the same room as other people. People who fixate on their electronic devices when they should be interacting with others in a group setting are “alone together.” Although people often rationalize that this behavior is a productive use of their time, Turkle warns that substituting electronic communication for face-to-face communication will eventually lead us have only shallow, unsatisfying relationships that make us feel more alone than ever.

Your summary will differ from this one in the way it is written, but it should include roughly the same information.