These 13 tech giants have the best mottos to explain their plans for world domination

You can learn a lot about a person from the way they describe themselves. And the same is true for the biggest companies in tech.

Most companies have a mission statement - something that guides their business practices and strategy, at least in theory.

Some of these mission statements, like Facebook's and Google's (no, it's not "don't be evil"), are well known. Others, like Amazon and Apple's, are less so.

The best of these corporate credos explain exactly what a company does and how investors and customers can expect it to act, while poorly drafted statements can reveal deeper problems of identity and focus.

Here are the mission statements of 13 of the top tech companies: