Reuters: It’s 10 years to the day since the first clip (“Me at the Zoo”) was uploaded on YouTube, and the service has dominated online video-sharing ever since. But for how long? Facebook said on Wednesday that its users were watching 4 billion videos a day, compared with 3 billion in January and just 1 billion in September. That was enough for at least nine brokerages to raise their price targets on Facebook’s stock despite the company’s slowest quarterly revenue growth in two years.