Don't want crossposted comments? Read on.

[jameel]

From misspotsitt's journal:

1. Go to your "Journal" menu, and select "Journal Style"
2. To the right, you'll see what theme you're using, with a link stating "Customize Your Theme". Click that link.
3. Scroll down a little ways, and you'll see that on the left side of your screen, you have multiple options to modify your theme. Click on the "Custom CSS" link, and it should load the options for doing Custom CSS.
4. From here, all you have to do is go to the "Custom Stylesheet", and put in the text

/* ---FB-Twitter Comment Ticky Fix--- */
.b-repost-items, .b-repost-item, .b-repost-item IMG, #entry-form-wrapper .b-repost-item, b-repost-item-fb {
display: none;
}

.b-repost-item .repost_disabled {
color: #CCC;
display: none;
}

There. You're welcome.