2.68M accounts from Uiggy (uiggy.com) were exposed in this breach. Besides email addresses, it included genders, names and social connections.
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Email addressesGendersNamesSocial connectionsWebsite activity
In June 2016, the Facebook application known as Uiggy was hacked and 4.3M accounts were exposed, 2.7M of which had email addresses against them. The leaked accounts also exposed names, genders and the Facebook ID of the owners.
Source: Have I Been Pwned (CC BY 4.0)