Can AddThis Post to Multiple Social Bookmarking Sites at Once the way SocialMarker can?

Here is my recent tech support email to AddThis.com: I am embarking on the journey of online entrepreneurship, and one of my sites is blog.curetinnitus.org. I have the AddThis plugin installed, but SocialMarker.com allows me and my visitors to submit to multiple social bookmarking sites at once. For now, I...