Paper  bibtex   

@article{bakhshi_faces_nodate,
	title = {Faces {Engage} {Us}: {Photos} with {Faces} {Attract} {More} {Likes} and {Comments} on {Instagram}},
	url = {http://comp.social.gatech.edu/papers/chi14.faces.bakhshi.pdf},
	urldate = {2018-02-27TZ},
	author = {Bakhshi, Saeideh and Shamma, David A. and Gilbert, Eric}
}