History and theory -- Museums online, from repositories to forums -- Digital heritage and sustainability -- Trusting the online museum -- Practice -- A practical social media primer for museum staff -- A survey of museum social media -- Cases -- The Museum of London (MOL) -- The Museum of World Culture (Vorldskulturmuseet) and the Carlotta Portal -- Comparing off- and online aboriginal, indigenous and 'ethnic' representations in Museums and Galleries in Sydney and Panama City -- Futures -- Augmenting the Garden of Australian Dreams at the National Museum of Australia -- Cultural interfaces to environmental data at the Questacon National Science Centre, Australia -- Conclusion.