Met my DH on a work course around 15 years ago when OLD was just taking off. I'd actually reluctantly arranged a date with someone through one of the now defunct OLD websites, but cancelled after meeting my husband to be!
My best friend met hers in a sleazy club when a group of us went on a girls' holiday to Ibiza in the late 1990s while on summer holidays from uni. They've been together since and married for 23 years.
The best one is my cousin's story, though. Her mum (my aunt) used to have a cleaning lady who used to clean for them regularly. I remember going to stay with them when I was younger in school holidays. My cousin and I would sit while the cleaning lady ironed and told us fascinating stories of her life growing up in India.
She was widowed at a young age and her brother had arranged for her to come to the UK with her young son. She used to talk so proudly about her son, who was our age and how she wanted to do all she could to help him make something of himself. We never met him, but she used tell us about how well he was doing at school, how he'd got into grammar school etc.
Anyway, the years passed. Cleaning lady stopped working for my aunt, but they stayed in touch as friends. My cousin moved away for uni, but came home in the holidays. One day, my cousin's uni holiday leave coincided with the cleaning lady visiting my aunt for a tea and chat.
The cleaning lady's son had arranged to collect her from aunt's house (the son she used to mention to us). He rang the doorbell, my cousin answered the door and (they both still maintain), it was love at first sight. They both also had lots in common, with both studying medicine at uni in neighboring cities! They've now been happily married for 25 years. The cleaning lady still tells those stories of her life in India to her teenage grandkids!