A check-in is a way to indicate your location at a particular place, and, if the check-in is public, share it with friends. In its simplest form, it’s a status update, indicating where someone is at a particular time.
Nataly Kogan, Vice President, WHERE
@Eric_Andersen #TechDayCamp Source: Location-Based Marketing for Dummies
Active – Users must consciously take an action to check-in, e.g. click a button
Passive – The check-in is transparent to users, i.e. does not require them to do anything explicitly. This could be triggered by proximity to a location, or by some other action such as swiping a credit card.
@Eric_Andersen #TechDayCamp Note: While supporting check-ins, SCVNGR has additional “challenges” at each location, and also incorporates scavenger hunt-like capability. Some additional unique features such as “social check-in”
@Eric_Andersen #TechDayCamp Note: Launched in August 2010, but revamped in August 2011 – the mobile-only Places feature was “phased out” and replaced with ability to add location to anything (status update, wall post, etc) Source: https:// blog.facebook.com/blog.php?post =10150251867797131