This errant post was due to an error with Delicious.

When delicious' feed system has an technical error, they post a new item in Delicious feeds that contains the text "Something went wrong". dlvr.it sees this as a newly created item, and posts that to your social networks.

As noted in the post below, Delicious has technical issues with their feeds periodically that cause old / unexpected items to appear in their feeds.
http://support.dlvr.it/entries/20372261-why-did-dlvr-it-post-an-old-item-from-my-feed

This is a case where delicious temporarily populated their feed with old / erroneous items.

We regret any inconvenience. Unfortunately, this is a repeat issue that delicious has not yet fully resolved.

Thanks for your patience. Let us know if we can be of further assistance.

To ensure that you do not have this issue in the future, you could add a filter inside of dlvr.it -- instructing dlvr.it to ignore items that contain "something went wrong".  With this filter in place, dlvr.it would not post an item containing the phrase "something went wrong"

More on using dlvr.it filters:

http://support.dlvr.it/entries/20295366-how-do-i-use-dlvr-it-s-filt...