Apple on Wednesday released Safari 5.0.1, the latest version of its Web browser. It has extensions enabled by default, as well as security patches. The extensions include tools for Twitter and other social networks, news and shopping. They are organized into categories and are available at the Safari Extensions Gallery. Apple is also calling on developers to create more extensions. Safari 5.0.1 has extensions turned on by default, unlike its predecessor, Safari 5.0, which required users to turn the extensions on.