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if you figure a way to remove spam, all the old protocols can be popular again.

Huh? There is no spam with RSS or IM. The user chooses what to consume.

And spam is a solved problem with email.

if you inevitably tried to build an RSS directory or search engine, there would be spam. IM is already full of spam, like IRC and email

> And spam is a solved problem with email.

you mean, with centralized online mail services