Answer:
The Internet has changed business, education, government, healthcare, and even the ways in which we interact with our loved ones—it has become one of the key drivers of social evolution. The changes in social communication are of particular significance.
I’m not sure but I think it belongings.
Answer:
A target audience is the demographic of people most likely to be interested in your product or service. For example if you own a plumbing company, the target audience is property owners, both commercial and residential.
I'm not sure but maybe one of the two websites can help you
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http://wiki.netbeans.org/MusicAppUsingRESTRemoting
https://mukeshscience.wordpress.com/2014/05/26/adding-audio-to-java/