Hi Alex! Glad to have you here.

This is indeed a popular idea. The biggest problem with it is privacy concerns. 
The best summary I've seen is at 
 In particular if such a suggestion were implemented, any web page would be 
able to easily determine the browsing history of any user, similar to the old 
visited link color trick.

I don't know what the latest is on attempting to get around this, although that 
document suggests some ideas.

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