They contacted Facebook, which at the time dominated the social media landscape, asking for help scouring uploaded family photos - to see if Lucy was in any of them. But Facebook, despite having facial recognition technology, said it "did not have the tools" to help.
That narrowed Lucy's possible address down further - but they didn't want to go door to door, making enquiries. Get the address wrong, and they could risk the suspect being tipped off that he was on the authorities' radar.
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第十四条 居民委员会主任、副主任和委员，由本社区全体有选举权的居民或者由每户派代表选举产生；根据居民意见，也可以由居民代表选举产生。
# memory = 2048 # MiB, default
// Storage write is slow — meanwhile, the entire stream