social media group project my part microsoft

My topic is Microsoft
These are the three main things you need to do:

First, you need to find references to answer these questions (1 source for each question)

Marketing/ Sales
describe how social media is being used?
what technologies are being utilized?
how business processes work ?
how effective they are?

Second, you give me the link of each source and also summarize each source

Third, you answer one question in the paragraph, so it means you need to write four-paragraph to answer 4 questions. You must write this in your own words.

This is my part of the group project. If you want to understand what the project is about, you can review my whole instruction. The file is below. However, the only thing you need to do is my part.