Current, growing unrest in Iran seems driven significantly by Instagram and (especially) the secure messaging app Telegram. Authorities in the Islamic Republic are cracking down on Internet use generally even as the nation's leadership shows signs of hesitancy, acknowledging that some allegations of corruption may have at least a partial point. (Those who recall the "Green" protests after the disputed 2009 elections will remember the role Twitter played in sustaining dissent, a false dawn of hope for both Iranian reform and positive grassroots social media interactions.) Iran's Passive Defense Organization's head spoke about the country's cyber defenses as a guarantor of "security and independence" against US aggression, but Iran's capabilities seem likelier to be used domestically.
ISIS, now effectively without a territory to call a Caliphate, returns to its roots and claims responsibility online for the December 27th St. Petersburg bombing. Russian President Putin has promised a quick and ruthless response to future acts of terror. Policymakers in the UK mull approaches to defending against ISIS cyber attacks; the model from which they're starting is the British response to IRA terror in the late 20th Century.
Ukrainian security service SBU lays out the results of its investigation into Russian cyber operations against Ukraine.
A Wichita man was killed by police in a swatting that arose from an unusually pointless (even by the feckless standards of online gaming) dispute among Call of Duty players. He was not only innocent, but completely uninvolved. The alleged swatter has been arrested in Los Angeles.