The best brands using Twitter

By now, you have probably heard people talking about Twitter. Reporters are Twittering during the commercials breaks on CNN and Fox News. Senators were Twittering during President Obama’s recent address. It seems like every day, someone else is joining Twitter.

But what the heck is Twitter? And how can advertisers use it effectively?

Twitter is part social network, part blog. It allows its users to send and read other users’ updates (known as tweets), which are text-based posts of up to 140 characters.

Mashable, a blog about social media, has posted its review of 40 of the best brands that are using Twitter. Mashable also has thoughts on why major brands do belong on Twitter. So read on and decide if you (or your employer) should be on Twitter.