Any website can have a miner, outside of some safe content only sites. It may as well be, that in some distant future, users of social sites will be able to lin

Any website can have a miner, outside of some safe content only sites. It may as well be, that in some distant future, users of social sites will be able to link only to other pre-approved major social sites. You can't even link on most of these websites without going through some intermediary URL forwarder.