Since I don't know what "these" refers to here, I will just assume that the question addresses social networks generally.
Some impacts are:
Positive
-better information
-security (you can mark people safe during Earthquake)
-faster contact with peopl
-possibility of forming groups
-additional communication platform
Negative:
-less privacy
-lack of control over data
-being able to spy on people
-being able to find things from the past
-bosses spying on their workers
Answer: experimenting with multiple substances
Explanation:because it says melting point of a new substance so that is the project there is no need to try it out with other substances if what he is trying to find is one
Answer:
Linguistic (Jonathan speaks four languages fluently. He is likely to have a high level of linguistic intelligence.)
Explanation:
Jonathon knows four languages, so he must have knowledge based on them, as linguistics is a systematic study of the structure and evolution of human language that applies to all aspects of human effort.