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Reference.org
Chat line
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<p>A chat line is a service that allows people to meet and talk with others via <a href="/facts/Telephone_call/4wUtUXpY">telephone call</a>. When multiple people can join the call, they are also called party lines. However, more recent[<i>when?</i>] chat lines are similar to <a href="/facts/Citizens_band_radio/tCSXXuTb">CB radio</a> in which a number of people both listen and speak together. </p>