I've been a user of Hootsuite in the past — the online Twitter client that lets you schedule tweets in advance, manage your accounts, track stats, and even hook up with your Facebook page from one place — but if you just want to make sure your Twitter page is populated 24/7, then check out TwitVance.
TwitVance exists merely to make your tweeting life a little sweeter. You can schedule an unlimited amount of tweets in advance on multiple accounts, and it even works with Bit.ly so you can keep your tweets under 140 characters. Plus, you can see a list of scheduled and published tweets so you can keep track of your messages. Word.
Do you have an interesting website you want to share? Create a PopSugar account or log in to your account. Then join the Website of the Day group, where you can post your favorite website! And you never know, it could be featured on GeekSugar! Here's a detailed guide to posting questions or posts to groups if you are new to the PopSugar Community.