A lot, as it happens. Henry Kautz, chair of the computer science department, and his colleagues have shown that Twitter messages can be harnessed to predict the spread of infectious diseases, for example.
Error type: "Forbidden". Error message: "Daily Limit Exceeded. The quota will be reset at midnight Pacific Time (PT). You may monitor your quota usage and adjust limits in the API Console: https://console.developers.google.com/apis/api/youtube/quotas?project=537752813138" Domain: "usageLimits". Reason: "dailyLimitExceeded".
Did you added your own Google API key? Look at the help.