Which groundbreaking social media campaign was launched by NASA in 2013 to dramatically increase public engagement with space exploration?

The astronomy industry has evolved dramatically in its approach to public engagement and product marketing. From telescope manufacturers to planetarium experiences, astronomy brands have developed unique advertising campaigns to capture public imagination and connect people with the cosmos. Test your knowledge of how astronomy products and services have been marketed to the public throughout the years!

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#AskNASA Twitter Q&A sessions
#SpotTheStation alerts for ISS sightings
#GlobalSelfie Earth Day mosaic project
#NASASocial behind-the-scenes access program