Because she's the (inter)mediator, getting their plebian content out to a wider audience. At least, that's how the dog-fuckers who solicit content from the public justify this to themselves - as serving a purpose that the plebs themselves can't fulfill.
It's absolute bullshit, obviously. Laziness and an unwillingness to research issues beyond tweeting for opinions. What gets lost is that those you're tweeting to are a self-selected group (of, say, Laurie fans), so your "crowd-sourced" data is value-laden and quite possibly skewed and full of Laurie-pleasing rather than "truths" or "facts".