Understanding main ideasComplete the summary with information from the passage. Use no more than one word or number for each blank.As social media is becoming a part of more people’s 1._______, researchers have become interested in finding out how users spend their time on social media. The world’s most 2. _________ social media site is Facebook. Generally, users spend more time reading their friends’ news and 3. ___ __ _____ on their posts than adding to their own 4. ________. With more people gaining 5. ______ to the Internet, the popularity of social media is expected to keep growing.