Someone who goes through your old posts and photos on Facebook and comments on them, resulting in a large chain of spam which usually contain vulgar terms directed at this necrologist.
Oh my god Frank is such a Facebook necrologist, he gave me 50 notifications and everyone who got em too is pissed as fuck at him!!!
July 30, 2011 Urban Word of the Day
a person who never misses a chance to post a "R.I.P. insert name" status update in Facebook as soon as any celebrity dies.
My News Feed is full of fucking Facebook necrologists updating me on Amy Winehouse's death for 38th time in the last 2 hours.