Boston Marathon runners warned not to overshare on social media

The Boston Athletic Association (BAA) has warned participants in next Monday’s Boston Marathon against posting their bib numbers on social media sites like Facebook and Twitter, or risk having their results wiped out.

The warning stems from incidents last year in which some runners made copies of legitimate bib numbers presumably seen on social sites, then were found out when officially registered runners went to look up their photos online after the race — only to find other people wearing their numbers. Among the culprits, the wife of social site Foursquare’s owner (when she was found out, Foursquare’s Dennis Crowley issued a public apology on her behalf).

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