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@hgtonight the Facebook connect plugin does not pass the real names in my installation. It allows them to choose a username after connection.
Here is why I don't want spaces.
First, mentioning a username with a space doesn't work in my installation even though I add quotes like this @user name
Apart from that I prefer usernames without spaces in them.
Sorry I didn't mention the spaces in usernames only happens when users sign in with facebook, twitter or google plus. This solution doesn't seem to fix it. @x00