VKontakte is seeing a surge in pro-Kremlin rhetoric surrounding Ukraine, but also anti-war sentiment in common interest groups.
A little-known police agency known as Center E is cracking down on dissent.
The contest seeks "pure-blood" white women who "love and honor" the memory of Nazi Germany leader Adolf Hitler.
One of the world's largest porn sites has introduced mandatory logins in Russia, synced with users' social media.
One in five Ukrainians could now be on Facebook, digital market research figures show.
VKontakte has apparently been breached and a hacker is trying to sell the logins.
The future of social media websites in Russia depends on "whether or not they cooperate with law enforcement authorities", Vladimir Putin's online advisor said.
The 21-year-old cheerleader is seen giving a Nazi salute.