Social media (SM) use is becoming prevalent among young people. While the research community has recently taken an interest in these evolving phenomena, it is still mostly unknown how early age use of SM affected perception of others (i.e., the feeling of social presence) in SNS and behavioral intention to follow the provided information. Also, how the SM interface and endorser types of effects on early usage of SM have not been investigated. To address this research gap, this study conducted the online experiment involving 534 participants, employing a between-subject design of 2 (channel: SNS vs. web) x 2 (endorser: peer vs. medical doctor). The experiment aimed to investigate the effects of accumulated SM technology usage and the age at which individuals begin using SM while they were exposed to identical health information. The findings revealed that individuals who initiated SNS usage at an age older than 18 experienced sense of social presence (SP) as a result of SNS' channel, rich modality (i.e., video), and source (i.e., peer endorser). Perceivers with an SNS beginning age of less than 18 years old, on the other hand, did not exhibit any relationship between SNS channel, and source endorser. Irrespective of whether the participants began using SNS at a younger or older age, both groups exhibited a stronger perception of face-to-face communication with the endorser with higher media usage behavior. This enhanced SP led to more positive attitude, a stronger subjective norm, and greater perceived behavioral control, resulting in higher intention to act on the endorsed information. The discussion section addresses potential explanations for these findings are addressed.
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