In the last 20 years, it seems that computers have taken over. They're in our homes, they're in our hands... darn it, they're soon going to be in our heads, for sure!
Sponges pick up bacteria if they're not cleaned right. Zap a wet one in the microwave for 2 minutes every day and replace it every 2 weeks. Better yet, use cloths, towels, and rags that you can toss in the washer or clean with bleach.