WhatsApp and Snapchat are examples of growing by doing the exact opposite thing of twitter: make a useful service for all of us who doesn't want the world to kn

WhatsApp and Snapchat are examples of growing by doing the exact opposite thing of twitter: make a useful service for all of us who doesn't want the world to know about our every move but still have group chats with 10-20 people at a time. They also tell us up front how they are going to make money. They have earned my trust despite of their authentication issues a while back, - and, unlike twitter they have a lot of space to move in (pay for api access anyone? Voluntarily subscriptions to feeds? )