To post to Twitter with no URL:
1) Log into dlvr.it
2) Click on your Socials tab, click on the Twitter account, and click on Edit
3) Go to the 'Post Content' tab
4) Toggle the switch for "Post Url" to the 'Off' position
5) Select "Post Title" and/or "Post Body"
6) Save
Tip for Advanced Users:
When posting Body, you may choose between Summary and Full Body content:
http://support.dlvr.it/entries/264365-feeds-summary-vs-full-body
Check out dlvr.it's Twitter automation tool for free!