The document discusses barriers that museums face in adopting Web 2.0 technologies and allowing user-generated content. Some of the key barriers mentioned include doubts that users would be interested; concerns about protecting institutional reputation and brand; lack of technical expertise; and issues around content ownership, legality, and context. The document argues that museums should start embracing Web 2.0 to remain relevant and engage new audiences, and that many perceived barriers can be addressed through things like user testing, separating user and institutional content, developing technical skills, and being open to new models of content sharing and funding.