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I can say something about spyware. Spyware apps remain hidden on the target's device and record their activity in real time, which can be accessed by the hacker remotely at any given date.  You can read some good info about how to hack a snapchat account https://celltrackingapps.com/hack-someones-snapchat/ This allows the hacker to view that person's activity—and archive it—on Snapchat. These allow messages, photos, and videos to be read, archived, and screenshotted. Such apps generally include location tracking as well.