Hashtag Homies 

Friends who rarely ever see each other in person, but communicate more frequently using social media. This can include tagging each other in memes, sending snapchats back and forth, tweeting at each other, or any other method of online communication.

"Have you seen Mark since high school?"
"No but we're hashtag homies so we snapchat each other all the time."

Hashtag Homies by Kc-113 November 8, 2017