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Harry Potter
Harry would be all over Facebook, and he'd have a ridiculous number of friends: He is the ~Chosen One~, after all. He'd be addicted to posting statuses and "checking in" everywhere, which would piss off Hermione to no end. And of course Mrs Weasley would comment on every. Single. Status.
Facebook / Warner Bros. / Ellie Bate / BuzzFeed
Ron Weasley
Ron's Twitter would probably just consist of him complaining about stuff – mostly when Harry makes him do something dangerous – and making dumb jokes every once in a while. He'd also be really, really good at using emojis.
Twitter / Warner Bros. / Ellie Bate / BuzzFeed
Hermione Granger
Hermione would definitely be all about Tumblr: She'd use it as a platform to promote SPEW, and obviously would get hundreds of thousands of reblogs. She'd also probably start a Change.org petition to help her campaign. Oh, and Dumbledore would take time off from his busy schedule to do Tumblr AMAs.
Tumblr / Warner Bros. / Ellie Bate / BuzzFeed
Ginny Weasley
Ginny's Instagram would be full of family photos, selfies with Harry, and pictures of her Pygmy Puff, Arnold. She'd also definitely share a #tbt every single Thursday, without fail.
Instagram / Warner Bros. / Ellie Bate / BuzzFeed
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If The Characters Of "Harry Potter" Had The Internet