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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Instant_messaging/8lwwDyjK">Instant messaging</a></li> <li><a href="/facts/Online_chat/UXwSoP4j">Online chat</a></li> <li><a href="/facts/Chat_room/QbFjlYQU">Chat room</a></li> <li><a href="/facts/Beep_line/R853328I">Beep line</a></li> <li><a href="/facts/Party_line_(telephony)/CsRE9v6g">Party line (telephony)</a></li> <li><a href="/facts/Synchronous_conferencing/7pcyspul">Synchronous conferencing</a></li> <li><a href="/facts/Videotelephony/Ya9TMFQD">Videotelephony</a></li> <li> Telephones portal</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Noll, A. Michael (2007). The Evolution of Media. Lanham: Rowman & Littlefield. pp. 34–35. ISBN 978-0742554818. OCLC 70778314. <a href="978-0742554818" target="_blank">978-0742554818</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>