The Influence of Promotion and Marketing via Facebook Social Media on the Volume and Sales Value of Sago Crackers Yandi Rismawan, Dhian Herdhiansyah, Weka Gusmiarty Abdullah Tekper : Jurnal Teknologi dan Manajemen Industri Pertanian Vol. 4 No. 2 2023 DOI 10.33772/tekper.v4i2.25536