Some years ago I suggested a procedure using Google spreadsheets for glossary collaboration in projects. Many people do this sort of thing now. What I do not think most are doing, however, is accessing these web-based term lists efficiently as terminology resources in their work. It's hard to compete with the efficiency of integrated termbases, TMs, web search features, etc. ... unless of course you integrate a web search for those online spreadsheets which returns just the few data of interest.