UPDATE June 8th 2019
Facebook has shut down graphsearch. The search with facebook is not available anymore.
With this tool you can search for keywords on a specific date or timerange simultaneously on Facebook and Twitter. It helps you to find breaking news or eyewitnesses. Simply type in one or more keywords and select dates (if you are looking for tweets from right now, it might be useful to define a range from yesterday to tomorrow). Then decide, if you want to search on Facebook or Twitter. To search on Facebook you have to be logged in.
Your searches will not be stored.