Search Lite aims to make things faster and more data-friendly for some markets by working on slow connections, supporting offline features.

The company will roll out controls that allow people to tell it they don't like a topic, which will inform Twitter's decisions on what to show them.

It has also tweaked its visual search tool, which lets you select an object within a Pin and find items that are similar.

The doc looks at the difficulties experienced by the producers, cast and crew of the film starring Christian Bale, Oscar Isaac.

Facebook has had policies against hate speech and violent threats, but it has sometimes been slow to remove posts that include them.