Apple actually lets you know that someone is "tagging alone".
But only if you have an iPhone, which is apparently about 30% so the other 70% are easy to stalk. Just because company A makes a creepy product doesn't excuse company B doing it.
Apple have an app that 'droid users can download that provides this functionality.
But yeah.
That is only available in some regions and doesn't run in the background so you have to spend the rest of your life checking. Yay.
@Howard started
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But only if you have an iPhone, which is apparently about 30% so the other 70% are easy to stalk. Just because company A makes a creepy product doesn't excuse company B doing it.