Possible Clues:

• #StarringJohnCho, e.g
• Most of the meat from hotel consumed by men-only party addressed on social media
• Metadata used to link social media posts
• Symbol which is also called “pound sign” in the US
• Symbol used to indicate the subject of a Twitter message
• Character in many a tweet
• Tweet bit
• Trending marker
• Symbol in a 34-Across
• Symbol of modern communication