German Internet entrepreneurs the Samwer brothers have taken a stake in social networking site Facebook, Alexander Samwer told Reuters on Tuesday. Samwer, who declined to reveal the size of the stake, said the brothers would now become Facebook's strategic partners in Europe. Samwer would not disclose the size of the investment, except that it was a "significant" amount, and less than the $240 million Microsoft paid for a 1.6 percent stake in Facebook in October, which valued the site at $15 billion. (Reuters)