Since you can vote for for multiple charities, there's no reason (apart from your personal feelings about the individual charities, of course) to not also vote on the following (the last two are Givewell rated charities):
The Clear Fund is Givewell's registered name as a charitable foundation, for legal reasons. Jumping through bureaucratic hoops is sufficiently difficult that doing so over, or even changing the name of a foundation, is difficult. However, there apparently aren't restrictions on having 'Givewell' as the public-facing title of the organization, or a subsidiary, or something like that. I imagine the name comes from when Holden Karnofsky and Elie Hassenfeld started it as a project to discover charities with transparent operations, hence "Clear" Fund, before they re-branded and took on the project of fully fledged charity evaluation.
http://www.reddit.com/donate?organization=582565917
"Today we are announcing that we will donate 10% of our advertising revenue receipts in 2014 to non-profits chosen by the reddit community. Whether it’s a large ad campaign or a $5 sponsored headline on reddit, we intend for all ad revenue this year to benefit not only reddit as a platform but also to support the goals and causes of the entire community."