Michel's tweet, below, has been retweeted by almost 4,000 followers and was picked up by mainstream media.
Agreement— Charles Michel (@CharlesMichel) July 13, 2015
Donald Tusk, president of the European Council, followed minutes later with the tweet:
EuroSummit has unanimously reached agreement. All ready to go for ESM programme for #Greece with serious reforms & financial support— Donald Tusk (@eucopresident) July 13, 2015
The Sun's head of PR Dylan Sharpe questioned whether it had been the intention of the EU to break the news in this way:
BBC and Sky News running breaking news banner on the basis of this tweet. Wonder if he discussed before sending?! https://t.co/7DcKRw6cg0— Dylan Sharpe (@dylsharpe) July 13, 2015
Dirk Singer, founder of digital agency Rabbit, said this proved Twitter's value as a news tool.
According to the BBC, Eurozone leaders have reached agreement over a third Greek bailout, with Greece securing a growth package of €35bn (£25bn) and debt restructuring. Greece will have to pass reforms of the Eurozone by Wednesday.
PRWeek contacted the EU press office, which was unable to comment at the time of publication.