1.Comfort and encourage. Twunkies (Twitter junkies) post personal life struggles on their accounts. Reply with godly advice and wisdom.
2. Inspire. Send out links to inspirational stories highlighting the amazing things God is doing.
3. Share Your Testimony. As you post your daily activities be sure to include your, hopefully, godly reactions to life's struggles.
4. Pray. Offer to pray for a need.
5. Look for opportunities. Use tools such as PeopleBrowsr or TweetDeck to search words such as "atheist" and then jump into the dialogue.