My site's 'trust flow' is currently 7 and I was wondering what does that mean? Can I tell from this whether I have a Penguin penalty for bad backlinks and what else does it mean? (I will ask a separate question on how to improve this score). Thank you.
We start with a large list on manually reviewed URLs. These have a crowd-sourced level of trust but by no means include all the trusted sites on the web. It turns out, though, that trustworthy sites tend to link to trustworthy neighbours. Those neighbours also tend to link to trustworthy neighbours themselves. In fact – after lots of iterations – those outside the circle of trust are put in the cold. So Trust Flow, like Citation Flow passes THROUGH urls like sound passes through walls – with awesome effects.
It sounds to me like they have implemented a version of Google's PageRank algorithm. However, for this metric all the weight starts out in a set of manually reviewed "trusted sites". Then they let the link juice flow through all the links they found when crawling the web.