(Bloomberg) -- Facebook Inc., Microsoft Corp., Twitter Inc. and YouTube are joining forces to improve their efforts to remove terrorist-related content from their online services, following pressure that tech companies might not be doing enough to deter extremists from using their platforms.

The four companies said today that they are creating a shared database of the most severe terrorist videos and images that they have removed from their sites. The database, which will be hosted by Facebook, will store "hashes" -- a kind of unique digital fingerprint created by a cryptographic algorithm -- for each piece of content.

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