**Background:** Rare diseases are characterized by scattered expertise and insufficient knowledge infrastructure. Collective intelligence (CI) networks—where geographically dispersed individuals exchange knowledge online—offer promise for improving diagnosis and management. The RARE-e-CONNECT project (co-financed by the European Regional Development Fund and Republic of Cyprus, grant POST-DOC/0916/0222, 2019–2022) created 25 patient communities and 25 healthcare communities organized by disease group, plus general forums, medical teams for professionals, a patient stories wall, a specialist centre repository, and a doctor-patient forum. The study aimed to identify parameters that matter for patients, healthcare professionals, and policy-makers in adopting such a CI network in Cyprus, a small EU country.
**Methods:** A participatory mixed-method approach was used: (1) a needs assessment survey with 27 patients/families and 26 healthcare professionals at the two largest referral hospitals in Cyprus; (2) semi-structured interviews with 40 patients/families/patient representatives, 37 clinicians and laboratory scientists (including national ERN coordinators/members), and competent bodies (Ministry of Health, National ERN Board Representative, Cyprus Medical Association); (3) activity metrics from 251 patients/families and 210 healthcare professionals registered on the platform between 23 September 2021 and 23 September 2022. Qualitative data (1,357 coded text segments) were analyzed using grounded theory with open, axial, and selective coding, interpreted through the Unified Theory of Acceptance and Use of Technology (UTAUT), Medicine 2.0, and CI frameworks.
**Key Results:** The needs assessment confirmed Web 2.0 literacy and willingness to collaborate. Qualitative analysis generated 1,357 codes under five UTAUT categories. Under actual use, four subcategories emerged: describing journey to diagnosis (136/1,357 codes), being a mentor to others (147/1,357), everyday challenges (145/1,357), and specialists sharing expertise (12/1,357). Performance expectancy (368/1,357 codes) included raising suspicion among GPs, myth-busting, need for European collaboration, and patient education in layman terms. Effort expectancy (75/1,357 codes) highlighted time constraints, need for community managers, and preference for non-written modalities. Social influence (129/1,357 codes) revealed inhibiting factors: "fiefdoms—individual thinking/practice," hierarchies, taboo around rare diseases, and the perception that "foreign doctors are never wrong." Enabling conditions (344/1,357 codes) included previous experience with networks, lack of hedonic pleasure (psychological burden), and critical policy gaps: no nationally accredited centres of expertise, no telemedicine/shared care regulations, and insufficient specialized staff. Activity metrics showed patients were more active than professionals: 84 posts vs. 24, 122 replies vs. 5, 25 patient stories. Anonymity was important for patients (50 fully anonymous, 139 semi-anonymous, 62 not anonymous). Healthcare professionals created 23 medical teams but requested zero meetings.
**Clinical Implications:** The RARE-e-CONNECT platform demonstrated potential to serve as a CI tool for pre-diagnosis awareness-raising among clinicians and post-diagnosis education and psychosocial support for patients. However, integration into practice requires: (1) formal accreditation of national centres of expertise and diagnostic labs; (2) telemedicine and shared care regulations with reimbursement mechanisms; (3) dedicated community managers to animate participation; (4) cross-referencing between CI systems across regions and languages, ideally under the EU Joint Action for ERN integration. The study is limited by digital literacy bias and pandemic-related constraints, and represents a first-phase work-in-progress toward building critical mass for sustainable knowledge-sharing networks.