Rather than tweeting about tech, I tweet about my experience with OCD. It's been a fantastic experience and there's a lot of positivity in the OCD/mental health community.
In terms of causes, OCD is substantially heritable. I think this sentence from a recent review paper (https://pubmed.ncbi.nlm.nih.gov/34030745) summarizes what's known better than I can: "Despite significant efforts to uncover the genetic basis of OCD, the mechanistic understanding of how genetic and environmental risk factors interact and converge at the molecular level to result in OCD's heterogeneous phenotype is still mostly unknown."