Foto: "<a href="https://www.ccnull.de/foto/social-media-interactions-on-mobile-phone/1047228" target="_blank">Social media interactions on mobile phone</a>" von <a href="https://www.ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://www.ccnull.de" target="_blank">ccnull.de</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>