Intelligent Railway System for Preventing Accidents at Railway Passing Points and Damage to the Rail Track

摘要

An embodiment of the invention provides a method for controlling access to content in a social networking website, wherein a connection is established between a first user and a second user on the social networking website. Content on the profile pages of the first user is categorized into a first content category and a second content category. The first content category includes content created before the connection between the first user and the second user was established. The second content category includes content created after the connection between the first user and the second user was established. Content in the first content category is also categorized into a first subcategory and at least one second subcategory. Access by the second user is restricted to the first content category. Specifically, the second user is prevented from viewing content in the first subcategory and permitted to view content in the second subcategory.