It's a simile. He watched he rocky peaks that stretched to the sky. Where they ended they looked jagged, like shark teeth.
It's mainly pointing out how little we worry about social networking and the effects of using it.
Answer:
Incomplete thought
Explanation:
If the highlighted portion was a thought on it's own, it wouldn't make any sense.
Answer:
Common phenomenon
Explanation:
The concentration of media in the space around us is very high.
The scale of use of mobile and stationary, traditional and new media is very large.
