A wise editor once told me that they wouldn’t even consider someone for an interview if they didn’t have a Twitter account.
That may seem harsh, but in reality social media is such an important way of sourcing news stories. By not having a Facebook or Twitter account, you are automatically at a distinct disadvantage.
Mention how much you use social media, how you use it, and how you would use it to find a story.
Make sure you know how many Twitter followers you have! This was a question I got asked in an interview and luckily I knew the exact number.
Talk about your blog if you have one and tell them what type of people you follow or pages you like.
Also talk about the negatives of finding stories by using social media, for example making sure information is legit and how to trawl through all the spam!