Answer:
Most media messages are organized to gain profit and/or power. Much of the world's media were developed as money-making enterprises. Newspapers and magazines lay out their pages with ads first; the space remaining is devoted to news. Likewise, commercials are part and parcel of most television watching.
Looks like maybe (if i could see the whole picture) probably D
Answer:
Advertising
Engagement
Introducing a new product
Explanation:
The post on the forum is introducing the new product, explaining it's use and benefits and also taking reaction from the forum members.