I've posted this same question on the wordpress forum for the plugin, so if you answer it there, feel free to ignore it here. I didn't know if anyone was monitoring that forum, there were no other posts...
I'm having a problem using the RTSocial plug-in with posts that are short. On one site, I'm using the_advanced_excerpt plugin along with RTSocial. There, if the post is shorter than the number of words specified for the excerpt, the like buttons at the bottom of the post are duplicated. Two sets of buttons. If I increase the post length so that it is one word longer than the specified excerpt length, the second set disappears.
On another test site, the only installed plugin is rtsocial. On that site, if the post is shorter than the 55 words in the default excerpt, the word "Like" is added to the end of the post text but only one set of like icons appears at the end of the post.