I tend to have one username that I use for most of the sites that require it (and thankfully it is almost always available). There are a number of sites where the user ID is an email (this post was inspired by yoxos), and this is OK, but it breaks up my flow of work when I have to login and I am asked to enter my "user id", and what they are really asking is my email.
I was wondering if there is some reason why the sites still ask for a "user id", even though they should be asking for "user email"? Maybe asking for a user id is more personal, and people don't like being asked their email up-front. But it also creates a very bad experience (at least for me). Any ideas why this is done?