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Depends on what you call 'useful'. If it is useful to learn how to kill hundreds of people in the shortest amount of time, and to learn how to castrate hundreds of men in the shortest time, then, yeah, they were useful.
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tworeasons we should learn about the holocaust
The crowd wanted to rejoice in Caesar's triumph.
To learn What God wants you to be like and to learn about Jesus and His Chosen People
learn through observation
It is useful for people to learn about some of he basic operations of arithmetic.
To amerce themselves into other cultures. To learn about there ancestry
They provide interesting fields of academic investigation and study. Some provide useful guidance on handling problems of the present time, if people were only willing to learn from past experience. Many stories make interesting and even entertaining reading.
English is a useful language as it is spoken in many countries in the world and understood in many other countries. It is also used internationally in many contexts, such as being the official language used by airline pilots. So for a lot of reasons, it is a good language to learn.
It is easy to learn about how to tag people on Facebook. There is a helpful Facebook blog and also help pages useful on the relevant issue of tagging.
Bias can be useful to historians by allowing them to learn about people's opinions and beliefs.