Table 3.

Data sets used in the forum post modeling.

Topic	Positive samples (n)			Negative samples (n)
	Model initialization data set	Annotated anonymous market/forum data set	Model initialization data set		Annotated anonymous market/forum data set
Promotion	Listing descriptions in the marketplace Agora and Alphabay (60,000)	Listing descriptions and product promotions in the anonymous marketplace (1000)	Amazon review data set [28] (30,000) and Yahoo! Answers data sets [29] (30,000)		Nonpromotion (ie, review and question answering) posts in anonymous markets and forums (1000)
Review	Amazon review data set [28] (100,000)	Review posts in an anonymous marketplace (1000)	Yahoo! Answers data sets [29] (100,000)		Nonreview posts in anonymous markets and forums (1000)