Some recent headline-grabbing cases of stalking range from frightening to downright horrific. But there’s also a subtler form of stalking, one that doesn’t require physical proximity: online stalking.

It’s one thing to occasionally check the Facebook page of an ex-boyfriend or ex-girlfriend, but it’s another, says psychologist and addiction expert Seth Meyers, to obsessively track someone on the web.

Here are three signs you might have crossed the line and should consider getting professional help...

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