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How can we identify malicious hackers participating in different online platforms using their usernames only? Disambiguating users across online platforms (e.g. security forums, GitHub, YouTube) is an essential capability for tracking malicious hackers. Although a hacker could pick arbitrary names on different platforms, they often use the same or similar usernames as this helps them establish an online "brand". We propose GeekMAN, a systematic human-inspired approach to identify similar usernames across online platforms focusing on technogeek platforms. The key novelty consists of the development and integration of three capabilities: (a) decomposing usernames into meaningful chunks, (b) de-obfuscating technical and slang conventions, and (c) considering all the different outcomes of the two previous functions exhaustively when calculating the similarity. We conduct a study using 1.2M usernames from …