In Forrester's evaluation of the emerging market for influencer marketing solutions (IMSes), we identified the 12 most significant providers in the category — AspireIQ, Captiv8, CreatorIQ, Impact, IZEA, Klear, Launchmetrics, Linqia, Mavrck, Tagger Media, Traackr, and Upfluence — and evaluated them. This report details our findings about how well each vendor scored against 10 criteria and where they stand in relation to each other. B2C marketers can use this review to select the right partner for their influencer marketing needs.