What do the reader pipeline icons mean?

Created over 2 years ago by Robert Batten with 1 comment
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Batten003 web400px Robert Batten · Author · edited over 2 years ago · 1 like
I’ve been looking at prepping my reader pipeline for a campaign, and I’d like some help interpreting the reader pipeline. Each prospect added has an icon in this column - all of mine seem to have an "i" followed by a person outline. I can’t find a key or a tooltip to explain what the icon means. 

Does it just tell me whether they are Inkshares users, manually added, gmail, or twitter? Or can it tell me more? Such as which ones are following my book (as opposed to just following me, or auto-added by Inkshares)?