Siri Suggestions is an iOS widget that keeps track of your app usage and recommends the apps you use the most. While the concept is useful for some, the implementation is a hassle for others because it shows a history of your most frequently-launched apps.
Jailbreakers now have a decent solution to the quarrel without losing out on somewhat useful functionality. A new free jailbreak tweak called HideSiriSuggestions by iOS developer Andreas Henriksson lets you hide individual apps of your choosing from the widget.