This Twitter themed set is a fun way to do exit slips.
On my bulletin board, by the door, I have students 'tweet' what they learned before leaving.
There are labels for students to create their @ name. The exit slips have two hashtag spots for students to connect their learning to the larger concepts (i.e.: If tweeting about the digestive system, they might #bodysystems, #staying healthy). Connecting to other concepts aids in long term memory and concept attainment.
Tweets are then added to the bulletin board under their @name using a tack, staple, or a clothespin that has a tack glued on the back (ideal). That way, others can read and learn from the tweets of their classmates.