A tweet link to http://twitter.com/share shows up for every item in the RSS feeds. My feeds are using the teaser format. This is when having the Locations/Node links set. It shows up as an <li> tag, but with the Tweet link one row down and not on the same line as the bullet.
I believe this problem might be related to #1032692: RSS tweet link points to http://twitter.com/share not the node, but am not sure.