I
noun
BAD : It is good to go out to work because you get in touch with other people.
GOOD : It is good to go out to work because you come into contact with other people.
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get in touch with = communicate with (someone) by letter or telephone: 'Don't wait until Christmas before you get in touch.' 'Mrs Taylor wants you to get in touch with her.'
come into contact with = meet: 'In my profession I come into contact with a lot of teachers.'
II
verb
BAD : People living in the city were not touched by the famine.
GOOD : People living in the city were not affected by the famine.
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When you mean 'have an effect on', use affect (NOT touch ): 'How will these new taxes affect people on low incomes?' 'Farms in the south of the country have been seriously affected by the drought.'