Texts and online communication are as impersonal as communication between people can get.
How so ?
Anonymous pamphlets were common in the colonial American era. There was however a 'public' and people tended to know who published them.
But 'impersonal' is only one aspect of communication. Television is intensely personal and radio more so. But they are also visual/oral/tactile and do not allow for response. Radio is credited with making the mass audience believe they had a personal relationship with the leader. Hence you got 4-terms FDR and Hitler also.
Text communication is more visual, and permanent. And the web is decentralized. From what I am seeing, we will start to see a big swing left in our politics quite soon, but also a measure of new Victorianism which will be a hybrid synthesized from today's customs.
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But as McLuhan taught us, we won't know the results of new technologies until years after.