It is young, hip and has more than 100 million users around the world. Now Yahoo! has agreed a $1bn dollar deal to buy Tumblr - will it recapture its long lost cool?
The young man whose car was hijacked by the Boston bomb suspects - but managed to escape - describes his terrifying ordeal.
The father of bomb suspect Dzhokhar Tsarnaev will travel to the United States as early as Friday, as FBI agents interview both parents to search for clues. But a trial could still be months away.
It has become the defining theme of the Obama presidency: how to protect a nation in an age of terror? But in the wake of the Boston bombs - is the homegrown threat now a fact of life?
Alienation, family breakdown and a turn to religious fervour. The parents of the Boston bomb suspects insist their sons were framed. But where did the Tsarnaev family go so badly wrong?
A path to citizenship at last? As Channel 4 News launches its series on immigration - America's 11 million undocumented migrants hope they will finally get legal status.
A night of chaos and terror on the outskirts of Boston. Gunfire, explosions, a police chase: one suspect dead, another, armed - still at large. But how did the authorities track them down?
This is a shameful day for Washington, President Obama declared - as his efforts to push through stricter gun control laws hit a brick wall in Congress.
Facebook boss Sheryl Sandberg - one of the world's most powerful women - shares her secret of career success. Don't hold back or sell yourself short, she says. Does her advice ring true?
The US Senate holds its first debate on major gun control legislation for almost 20 years. But the parties are split: now, even a compromise deal on stricter background checks could fail.