The problem with at least Facebook and Twitter (and possibly Google) in this analysis is that their attention-grabbing model requires them to analyse and interfere with the data which is coming through their systems. The only way not to do that would be for FB timelines and Twitter feeds to be strictly sequential feeds which at some point in the past they may have been but they are not now.
Once you start basing your business model on selectively making some content more visible, you have already crossed a rubicon between a strictly neutral common carrier and a publisher.
(There is an error in the quote where they use publisher when they mean common carrier, a publisher is precisely an organisation that does have full editorial control of what they put out which is the opposite of what they intend from the rest of the quote.
Once you start basing your business model on selectively making some content more visible, you have already crossed a rubicon between a strictly neutral common carrier and a publisher.
(There is an error in the quote where they use publisher when they mean common carrier, a publisher is precisely an organisation that does have full editorial control of what they put out which is the opposite of what they intend from the rest of the quote.