Current Barriers. Numerous other factors play a role: content creation tools, content storage, tools for communication, protocols/APIs, and identity management. simple blog or podcast works well for instructors new to technology.and more experienced instructors may end up using a wide array of tools to achieve intended learning aims. Social networking services Ning. APIs and Protocols. Open APIs and open protocols are key requirements for PLEs to grow as a concept. edit ] Current Barriers. From LTCWiki. Jump to: navigation , search Contents.