Introduction: Restraints and changes in social activities might contribute to loneliness and health decline for older adults. To reduce loneliness and support activities, social internet-based interventions are indicated to be effective. The aim of this study was to evaluate the effects of a social internet-based intervention for older adults who are vulnerable to loneliness. Method: An explorative, randomised, crossover study with an AB/BA sequence was completed. The intervention was conducted over a period of three months. Thirty participants were included (24 women and six men, 61-89 years old) and allocated to two groups. Data were collected at three time points. The primary outcome was the UCLA loneliness scale, and the secondary outcomes were satisfaction with social contacts and social interaction skills. Statistical analyses were conducted with the paired t-test, Wilcoxon's signed-rank test and repeated-measures analysis of variance. Results: Loneliness was significantly decreased in both groups post intervention, and satisfaction with social contacts online significantly increased in one group. Significant treatment effects were detected for all outcomes. Conclusion: The results of the social internet-based intervention programme are promising, but further evaluations are needed.

Client-centred occupational therapy interventions can support seniors' participation in SIBAs and their self-reliance when performing these activities.

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