#6 Page Suggestion - People who liked your Page through an invite from an admin
Timeline - People who liked your Page from the Likes section of their own Timeline or someone else's
Ads - People who clicked "Like" in an Ad or Sponsored Story pointing to your Page
Registration - People you added to your Page as admins
Mobile - People who liked your Page from a mobile device
Wizard Suggestion - People who liked your Page in the New User Wizard when registering for Facebook
Profile Connect - People who liked your Page on the Page itself or in a News Feed or ticker story
External Connect - People who liked your Page from an external site using a Facebook social plugin
Recommended Pages - People who liked your Page from a Recommended Pages unit on the right column of Facebook
Favorites - Other Pages that have liked your Page
API - People who liked your Page through an app developed by a third party
Page Browser - People who liked your Page using Facebook's Page Browser
Hovercard - People who liked your Page from the popup window they get when they hover over a link that leads to your Page
Search - People who liked your Page from their search results
Page Profile - People who liked your Page on the Page itself
Ticker - People who liked your Page from a story they saw about it in ticker
Like Story - People who liked your Page from a story they saw about a friend liking it
#7 People Talking About This (or PTAT) is the number of individual people who have engaged with your Page in a way that it created a “Story” that went out into the Newsfeed. This includes commenting / liking / sharing a specific post, liking the Page, mentioning the Page in a post, checking in, RSVP’ing to one of your events, photo-tagging the Page and writing a post on your Page’s Wall.
Engaged Users is the number of individual people who have engaged with your Page, regardless if the engagement created a Story or not. This includes everything from PTAT, plus actions like clicking on a post, opening up a link, watching a video, or viewing out your photos.
Virality Rate is the number of People Talking About This divided by the Reach (the number of people who have seen your Post). It measures all of the people that saw some content from a Page who created stories for others to see in individual newsfeeds.
Engagement Rate is the number of Engaged Users divided by the Reach, which measures how many people engaged with a Page, regardless if the engagement created a Story or not.
Organic Impressions represent the number of people seeing content in their Newsfeed or the Ticker.
Viral Impressions represent the number of people who see content from “stories” that get created when someone engages with a Page.
#8 Liking your page
Liking, commenting on, or sharing your page post
Answering a Question you’ve asked
Responding to your event
Mentioning your page
Tagging your page in a photo
Checking in or recommending your place