The illegal industry traps an estimated 46 million people globally, according to the 2016 Global Slavery Index, and produces profits of about $150 billion a year, according to the International Labour Organization.
Risk analysis firm Polecat analysed about 30 million social media posts and over 300,000 online sources daily, over the course of 90 days.
In research released on Friday, it found tea, coffee, coal, sugar and tobacco are among the top eight products that have an increased risk of slavery links.
The analysis also references particular geographical hotspots, where the risk of slavery is higher.
Topping the charts in social media was coal from North Korea, with 300 indications of risk-based language in the last 90 days, according to Polecat.