There are two effects that I want to talk about. Facebook Has a Negative Impact on the Concentration of Students, about 70-75 percent of high school students are falling behind in class because they spend many hours on Facebook.Therefore, it leads to lack of time to studying or concentration on school work.tudents watch adult movie on Facebook-As Facebook becomes popular, there are more users uploading a lot of music videos that was over 18. The problem is that on Facebook there are many middle school students around 8-9 years old always playing around, so the chance that they would watch adult videos is very high.
Today, private companies taking part in the contract tower program operate 218 ATC towers using approximately 1,200 controllers. By FAA estimates, the government saves approximately $250,000 per tower per year over what it would have cost the agency to run the same facility.
In the United States, the carriers have effectively exited the tower business. Most sold their towers to companies like American Tower (AMT) and Crown Castle. These companies construct, maintain and operate the towers, and lease space to the carriers. Tower operators such as AMT actively seek to lease the same tower to multiple carriers, and this is a key metric of their financial success. A best-in-class tower operator will have 2-3 carrier tenants per tower.