There are plenty of Twitter plugins for WordPress. Why would we want to make our own script?
Well, most of the plugins come with a lot of fluff you just don’t need. Ours will be simple and efficient; all it needs to do is grab your tweets and display them.
The other reason is control; you write the markup, so it’s entirely up to you how it is displayed.
The last reason is that because we’re getting the tweets directly from the Twitter API feeds (i.e. no verification is going to be needed), we can easily display tweets from a Twitter List instead of just our own tweets.