Hi, list! Twitter apparently appends all kinds of stuff to the query part of an url: This message, for example https://twitter.com/#!/LuaLang/status/187435092375900161 gives this URL: http://lua-users.org/wiki/LuaWorkshopTwoThousandTwelve?utm_source=dlvr.it&utm_medium=twitter Lua Users wiki does not like it. It says "Invalid URL or post". I'd say that the correct behaviour would be to ignore unknown query variables. Alexander.