Twitter made some tweaks to its short messaging system to make it simpler, faster and more personal. Visitors to Twitter's website should see the new look during the next few weeks. Twitter says it made the updates because many people don't understand how to use the service and various tools. It will be easier to find people and companies with Twitter profiles by typing an "at" symbol in front of a user's handle. Profile pages will be expanded so people and companies can showcase more information in text, photos and video.