Like most other social media companies, Twitter has focused on building a huge user base for a free service supported by advertising.
The sanctions, including travel bans and asset freezes, against Moscow were originally introduced in March 2014.
There are many problems facing the EU, including populism, migration pressures and slow economic growth.
European Commission president Jean-Claude Juncker has led EU and international tributes to those who those who perished in the London terrorist attacks.
The attacker who killed three people near parliament in London before being shot dead is named as British-born Khalid Masood.
Denis Voronenkov, who testified to Ukrainian investigators and criticized Russian policies after his move to Kiev last fall, was shot dead by an unidentified gunman .
Northern Ireland's main nationalist and unionist parties were given until March 27 to form a power-sharing government.
Russia chose Yulia Samoylova to represent the country in the May 11-13 contest in Kiev.
Dijsselbloem refuses to retract the comment that southern European countries “spent all their money on drinks and women and then asked for help.”