You can also try SheToldMe.
If you have enough content to be asking this question, you should consider setting up a blog for yourself, as well, if you don't have one. All these other article sites are great for building links and spreading your info, but a blog of your own is something that will build "equity" for you over time as you fill it with your own quality content.
Make sure the content you post in various places is not identical. I'm not sure what Hobsdv meant by duplicate content being "just a myth." You won't necessarily be penalized for having multiple of the same article spread around the Web, per say, but it's also unlikely more than one of the articles will rank. Google will simply choose what it deems the original source.