SP.UserProfiles.PersonProperties.isFollowed property (sp.userprofiles)
Gets a Boolean value that indicates whether the user is being followed by the current user.
Applies to: apps for SharePoint | Office 365 | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.UserProfiles.PersonProperties.get_isFollowed()
true if the user is being followed by the current user; otherwise false.
This value does not refresh if reloading an existing object, but it will update if a query returns a new PersonProperties object.