For anyone interested in 20th century history, following @RealTimeWWII on Twitter is a must. Created and managed by Alwyn Collinson, an Oxford grad student, this account tells the events of World War II in real time, with a 72-years lag.
Right now we are in May 1941, with the failed German airborne invasion of Crete, and witnessing the first signs of the führer's intentions to attack its former ally, the Soviet Union.
Reading those tweets you really get a feel for how things have been, and you also get a ton of lesser-known facts :
Nazi Deputy Führer Rudolf Hess has parachuted into Scotland on his 1-man peace mission. A local farmer has captured him at pitchfork-point.— WW2 Tweets from 1941 (@RealTimeWWII) May 11, 2013
You can ask questions to Collinson at @HistoryReal.Manu