Facebook comments appear also on second loop

Hello,

I would like to ask you, how can I prevent to put facebook comments also on my second loop posts.
expl.:
Settings are to show only on posts.
On my single template I have main loop and than after that loop I have another loop to show 3 random posts (there is the_excerpt()) and on all 3 posts is shown facebook comments, which I do not want.

Thanks for answer in advance.