Cara (from The Curvature) has posts which are going up at http://dayofblogs.thecurvature.com/ where she will post every half hour for 24 hours straight.
I did a similar effort last year for Stop It Now! and I now how much it helps to get supportive comments.
Update: I just made my donation to help support Cara's fundraising. I encourage everyone who can to make whatever size donation they can.
For those who aren't familiar with RAINN they have a toll-free hotline and a new online hotline and they do advocacy work in the field of sexual violence.