Read the paragraph about social media.

Social media outlets are often criticized as forums for unimportant postings and uniformed rants. Though much of what is posted is conversational drivel, social media outlets also serve as springboards for entrepreneurs. Creative people can advertise their designs or products at a low cost to a wider market than entrepreneurs could have imagined in previous generations. The Internet is the ultimate free marketplace, allowing motivated individuals to share their wares with the world.

What is the controlling idea?

Every entrepreneur should advertise one’s products on the Internet.
The Internet has countless forums on which people share meaningless posts.
Social media has a valid purpose as an inexpensive, creative marketplace.
Advertising products on the Internet is inexpensive compared to television.

Armed with invisible ink, a cipher system, and a passion to end the war and preserve the union, elizabeth van lew became butler's eyes and ears in the confederate capital city. truth be told, however, she became much more than that. she became a spymaster, the person responsible for running a network of agents, couriers, and safe houses that was very active during the war. in addition to the spying, elizabeth van lew continued to maintain her church hill home as a safe house and something of a local union spy headquarters. —the dark game, paul janeczko what is the central idea of this passage? van lew’s home was used as a safe house, which was critical to the confederacy. van lew had a passion to end the war and preserve the union. van lew was a spymaster, a leading force in the espionage activities for the union. van lew did not enjoy working for general butler.