FILE - Civilians flee as security forces aim their weapons at a hotel complex attacked by al-Shabab extremists, in Nairobi, Kenya on Jan. 15, 2019. Facebook has failed to catch Islamic State group and al-Shabab extremist content in posts aimed at East Africa as the region remains under threat from violent attacks and Kenya prepares to vote in a closely contested national election, according to a new study released Wednesday, June 15, 2022. (AP Photo/Khalil Senosi, File)