A person who is obsessed with knowing everything about anything, as soon as it happens. They spend all the time they can on Twitter, Facebook or news websites, repost everything they see, and will constantly talk about what they've seen or read or heard online. They usually feel completely lost without a link with that technology, namely their smartphone. They often prefer their online relationships or conversations to face to face interaction.
Samantha can't live 2 seconds without checking her phone, in case something happened since she last looked. She's become a media whore!