Enhancing student engagement plays a critical role in reducing student drop‐out rate in online learning as students usually feel isolated and disconnected in this learning environment. This requires a clear conceptualization of the student engagement construct and its underlying structure. However, the conceptual understanding of the student engagement construct has long been impeded by the inconsistency in its multidimensional structure and the conceptual ambiguity among its components. This study aims to examine the underlying structure of student engagement in online learning based on the bi‐factor exploratory structure equation modelling framework (B‐ESEM). Four competing models representing the underlying structure of student engagement in online learning were compared based on their degree of fit to survey data from 363 students in an online undergraduate program. Students' responses to the online learning engagement questionnaire were best represented by a B‐ESEM model that provided simultaneous assessment of a global engagement factor and specific factors of behavioural, cognitive, affective and social engagement while controlling for item cross‐loadings. However, behavioural engagement only retained limited specificity once the global engagement factor was taken into account. The study findings offer a solution to reconcile the inconsistency in the multidimensional structure of student engagement and reduce the conceptual ambiguity among its components, thus contribute to better measuring student engagement in online learning.

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Facebook has been used not only as a popular social network service among college students but also as a platform for promoting learning and teaching effectiveness in different subject areas. While previous studies have demonstrated the utility of Facebook for enhancing student engagement, little is known about whether there are different profiles of students with different engagement patterns in the Facebook learning environment. Adopting a person-centred approach, we aim to fill this gap in the current study by identifying unobserved sub-populations of students with respect to their engagement patterns in the Facebook as a supplemental learning platform. Latent profile analysis revealed three engagement profiles, a minimally engaged, a moderately engaged, and a highly engaged profile. Results also suggested that academic disciplines and teacher involvement in the Facebook learning activities were significant predictors of student membership in the three engagement profiles. Our findings offer implications for the design and delivery of Facebook learning activities that cater to different groups of learners with different learning needs.

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