phantom menacing
A close cousin to submarining but not exactly ghosting, phantom menacing is the continuous act of showing signs of life on someone's social media feed (mostly through likes, possibly retweets) repeatedly or in intermittent patterns. But what makes phantom menacing different from submarining is that the phantom menace never actually opens up a line of dialog with the target in public conversation or private messaging.

While a person can phantom menace someone of any gender that they have a platonic relationship with, phantom menacing is virtually always done to a woman by a man after hooking up or dating. He will do this for weeks or even several months after he last exchanged a word with her yet never actually talk to her even after liking hundreds of her tweets.
"Remember that guy John I hooked up with forever ago at that party? We still follow each other on Facebook even though we haven't spoken in almost a year. Why does he keep phantom menacing me every few months by liking up every single post yet not saying anything? I don't live in a fuckin guarded tower, JUST TALK TO ME."