Nobody thinks they're doing it wrong. Parents who monitor everything believe they're being responsible. Parents who don't monitor anything believe they're respecting their child's autonomy. Most are somewhere in between, and most feel some version of guilty about where they landed.
What Trust Actually Requires
Trust isn't the absence of awareness. It's the presence of a relationship where your child believes they can come to you. That's a different thing, and it's what you should be optimizing for.
A child who knows you're paying attention — not reading every message, but generally aware of their digital world — is more likely to tell you when something goes wrong. A child who knows you're reading everything tends to either become very careful about what they say or find ways around it. Neither outcome is trust.
The Age Factor
A reasonable approach at 10 is too restrictive at 15. The balance shifts as children demonstrate judgment and as their social lives become legitimately more private. Building in explicit progression — "when you turn 13, we're going to do this differently" — gives children something to grow into rather than a system to escape from.
Transparency About What You're Doing
Whatever level of monitoring you choose, your child should know about it. This is both an ethical position and a practical one. Covert monitoring, when discovered, damages trust far more than any level of overt monitoring does. Tell them what you're using, what it tells you, and what it doesn't. That conversation itself builds trust.
Finding Your Specific Balance
Consider three variables: your child's age and demonstrated judgment, the specific risks you're actually concerned about, and the quality of your current communication. A child who talks to you openly about their online life needs less structural oversight. A child who's closed off about it needs more of your attention to the relationship first, monitoring second.
The balance isn't a fixed point. It's a conversation you keep having as your child grows.