Even simple algorithms such as ordering posts by how many likes they got? I think it would be fair to put the burden of proof on thecompanies to prove their algorithms are "fair" and "unbiased", but this is a bit short sighted. Algorithmic feeds are good, they just be used for bad things.
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They would have to prove no bias, and no agenda. They would have to prove they used a neutral algorithm.
This might create a market place of algorithms, and smaller businesses that focus on algorithms, each having their own liabilities.
This should create an open social market with less hegemony of agendas.
We need to stop the secret agenda algorithms!