Totally agree with FixerMike77—great point! Those built-in Snapchat privacy tweaks are a must. Something I found super helpful is adding a monitoring app like Eyezy (https://www.eyezy.com/) to the mix. It lets you keep an eye on friend requests and account changes, without digging into actual chat content—kind of like a safety net in case something slips past the standard controls. 
Plus, I love your tip about making teens the first line of defense. Giving them the tools to spot sketchy accounts (zero Bitmoji, rushed convos, weird friend requests) really empowers them to make good choices! Have you tried combining these methods alongside parental control apps? It’s a lifesaver when you’re on the go!