Tesis ini menguji pengaruh dari keterpaparan tagar #2019GantiPresiden di tiga platformmedia sosial seperti Facebook, Instagram dan Twitter terhadap partisipasi politikmilenial DKI Jakarta baik secara online maupun offline. Pengujian tersebut berdasarkanempat tahapan mekanisme psikologis dari teori Model Partisipasi Politik Media Sosialdari Jonathan Knoll, Jorg Matthes, dan Raffael Heiss (2018). Metode penelitian yangdigunakan adalah kuantitatif dengan teknik pengumpulan data berupa kuisionerterhadap 400 sampel yang dipilih secara multistage random sampling. Pengujianhipotesis berdasarkan statistik deskriptif, analisis korelasi dan analisis regresi liniersederhana. Hasilnya menunjukkan bahwa (1) penggunaan media sosial berhubungandengan dan berpengaruh rendah terhadap partispasi politik online maupun offline (low& high effort) milenial DKI Jakarta, dan (2) rendahnya partisipasi politik milenial DKIJakarta terkait tagar #2019GantiPresiden pada pemilu presiden tahun 2019 karenamilenial tidak menganggap tagar tersebut sebagai tujuan dominan (dominant goalappraisal) dan menilai tidak adanya konsistensi atau pesan partisipatif (consistencyappraisal) pada tagar #2019GantiPresiden.

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This thesis examines the influence of exposure of the hashtag # 2019GantiPresiden on

three social media platforms such as Facebook, Instagram and Twitter to online and

offline political participation of Millenial of DKI Jakarta in the 2019 Presidential

Election. This research based on four of psychological mechanism of Social Media

Political Participation Model theory from Jonathan Knoll, Jorg Matthes, and Raffael

Heiss (2018). The research uses a quantitative method with questionnaire method of

data collection from 400 samples selected by multistage random sampling. Hypothesis

testing is based on descriptive statistics, simple linear regression analysis. The results

show that (1) the use of social media is associated with and influenced to the online and

offline political participation (low & high effort) of millennial DKI Jakarta, and (2) the

low political participation of DKI Jakarta millennials related to the hashtag

#2019GantiPresiden in the 2019 presidential election because millennials do not

consider this hashtag to be a dominant goal appraisal and assess the lack of consistency

or participatory messages (consistency appraisal) in the hashtag # 2019GantiPresiden