Even if you have a team that is posting, tweeting and sharing videos on social medias it is very important to consider and have a strategy on how this could reflect on your brand.
Established guidelines and good practices is what a clear social media policy is all about.
It is more often nowadays that companies receive negative press or even have to take legal action over things posted from their employees. You can avoid easily a PR disaster by training your staff and making clear written guidelines of what is expected.