Just-in-time blocking - Definition from the Hotspot Shield Glossary
This form of internet censorship is implemented at certain time periods and in certain geographical locations in reaction to a particular event such as a political rally or a government election. The public’s internet access will be completely blocked to maintain a level of calm and limit outside influences in terms of government upheaval or unrest.
Documented incidents of Just in time blocking include the 2005 Kyrgyz elections, the 2006 Belarus elections, the 2006 Tajik elections and the 2013 Iranian presidential elections. During these political events, various anti-censorship groups noted that access to such social media sites as Facebook and Twitter were blocked. By many, just in time blocking is seen as a negative form of government censorship that removes the transparency from elections.