It's inevitable that a self-consciously 21st century collection of ghost stories would include a tale about social media. Fortunately for me (and you, if you buy it) Cold Iron has one of the best examples of this sub-genre I've read.
Matt Wesolowski's story is written in the first person, present tense, and concerns a man who has had a bad breakup. Being 'ghosted', he helpfully explains, is being consigned to oblivion on Facebook, Instagram etc. Someone just stops responding to your messages - you have become invisible, or 'dead to them'.
The story features a nightmarish curry night with the lads, in which our hero is asked about his new partner. Drunkenness, confusion, and the inability to get a response to posts, messages etc all collide in a series of powerful images. Modernistic techniques are used to good effect. Finally all is made clear.
Traditionalists may not like this one. I liked it a lot. It combines deep feeling with excellent grasp of form and style. Another author to look out for.