Social media giant transfers control of all official White House profiles to new administration and activates a @SecondGentleman handle for Kamala Harris's husband Doug Emhoff
Change occurs after Trump ambassador David Friedman relinquishes account, but is swiftly reversed; spokesman says it was not indicative of policy shift
Move comes after Marjorie Taylor Greene again tweets false theories about election fraud; Twitter calls claim 'disputed,' saying it poses 'risk of violence'
Spokesman for German chancellor says decisions on restricting speech should be based in law, 'not according to a decision by the management of social media platforms'
Conservative platforms popular among Trump's fiercest supporters, like Parler and Gab, known for its far-right and neo-Nazi user base, have drawn a growing number of users
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