The IDF has published photographic evidence of the use of human shields by Hamas.
An IDF bird's eye video shows civilians gathering on a roof of a terrorist's house after the IDF fired a warning shot to indicate it was about to bomb it. Hamas achieved its aim in this case, because the IDF decided not to bomb the home.
The IDF Blog also said that Hamas has been distributing graphics such as the one below, encouraging Palestinians in Gaza to stand on the roofs of their homes to act as human shields.
A video produced by the IDF for Operation Cast Lead in 2008-9 showed the extent to which Hamas terrorists go in using civilians as human shields: