Sure, but not the entire song. We love seeing clips of your special dance online, but we also have to protect the song from being out in the public domain. As stated in our copyright notice:

If using the song in a video of your wedding event, you are allowed to use no more than 30 seconds of the recorded material. If you wish to use more than 30 seconds of the song, please contact me to obtain a sync license.

We understand the friends may record a video on their phone during the dance and post that to social media. That is not a violation of the copyright because the sound quality will prevent it from being used at another wedding.