You can examine the study of sociolinguistics and its benefit to society, the importance the study of sociolinguistics, and/or its place in modern culture. Some might not view sociolinguistics as being important but research suggests the opposite is true. A good starting point to examine any one of these topics is pbs.org/speak/speech/sociolinguistics/sociolinguistics/.
You might also want to consider the topic of "sociolinguistics and modern politics." The Eric educational database and Sage, among others, have excellent journal articles on the topic and you can expand on what other authors have deduced in their studies. A simple key word search in ProQuest and similar databases yields dozens of applicable articles.