Answer Suggestions:The scope of the answer to WHAT is asked in the question is VERY LARGE.
The question requires a connection between "advertisement in technology" LEADING TO "revolutionary changes" IN "global communities".
Therefore, some suggested points closest to what a student may answer are–
The role of advertisements in newspapers, magazines, radio, T.V, films, hoardings, internet, mobile phones, pamphlets, shows (beauty pageants, award shows, etc) exhibitions, fairs etc.