Twitter and Facebook are compared all the time; yet essentially they are two very different beasts. Twitter is a microblogging site where posts are 140 characters long; whereas Facebook is a multifaceted social network which allows status updates, photo upload, event posting and much more.

The main comparison between them as far as I can see is that they are probably the two most popular social media sites. But how do they compare in terms of using them for buzz monitoring?
Because of Facebook's privacy settings, it isn't possible to search for mentions of your business and see all the users that have mentioned you recently; you will only see the ones that have their settings as such that anyone can see their wall postings and updates. However most fan pages will not be set to private so you will be able to see any updates from these.

On Twitter you can see everyone's updates so in this sense it is better for searching for mentions of your brand. However, it isn't as popular or widely used as Facebook, so despite the Twitter results yielding more mentions in the same time frame, this alone won't give you a very accurate representation of the type of people talking about your brand.