On April 13, 2007, Google reached an agreement to acquire DoubleClick for $3.1 billion, transferring to Google valuable relationships that DoubleClick had with Web publishers and advertising agencies.
On 14 April 2007, Kasparov led a pro-democracy demonstration in Moscow. Soon after the demonstration's start, however, over 9,000 police descended on the group and seized almost everyone. Kasparov, who was briefly arrested by the Moscow police, was warned by the prosecution office on the eve of the march that anyone participating risked being detained. He was held for some 10 hours and then fined and released.
On 14 April 2007, an estimated 300,000 people marched in Ankara to protest against the possible candidacy of Erdoğan in the 2007 presidential election, afraid that if elected as President, he would alter the secular nature of the Turkish state.
The Virginia Tech shooting was a school shooting that occurred on April 16, 2007, at West Ambler Johnston Hall and Norris Hall at the Virginia Polytechnic Institute and State University, in Blacksburg, Virginia. Seung-Hui Cho, an undergraduate student at the university and a U.S. resident of South Korean origin, shot and killed 32 people and wounded 17 others with two semi-automatic pistols. Six others were injured jumping out of windows to escape Cho. As police stormed Norris Hall, Cho died by suicide by shooting himself in the head.
During a Copa del Rey semi-final against Getafe on 18 April, he scored a goal remarkably similar to Maradona's goal in the quarter-finals of the 1986 FIFA World Cup, known as the Goal of the Century. Messi collected the ball on the right side near the halfway line, ran 60 metres (66 yd), and beat five defenders before scoring with an angled finish, just as Maradona had done.
Trudeau faced off against Mary Deros, a Montreal city councilor and Basilio Giordano, the publisher of a local Italian-language newspaper for the Liberal nomination. On April 29, 2007, he easily won the party's nomination, picking up 690 votes to 350 for Deros and 220 for Giordano.
On 29 April 2007, Chelsea released a statement on their official website, informing fans that Ballack had undergone ankle surgery in Munich. As a result, Ballack did not play in the FA Cup final against Manchester United, which Chelsea won 1–0 through Didier Drogba's extra time goal.
On 1 May 2007, Nintendo acquired an 80% stake in video game development company Monolith Soft, previously owned by Bandai Namco. Monolith Soft is best known for developing role-playing games such as the Xenosaga, Baten Kaitos, and Xenoblade series.