Privacy & Security in Online Social Media

Source note: all 20 uploaded PDFs were byte-for-byte identical, so the source question bank is included once rather than repeated. The original PDF heading is “Quiz: noc21_cs28”; the course title matches the current NPTEL listing for NOC26-CS141. Option wording has been retained. The source repeats the same stem at Q542 and Q727 with different options and answer-key notes; Q727's stem has been rephrased to distinguish the two variants, and both source entries are preserved. Answer notes are retained from the PDFs and were not independently validated against every lecture.