Do you have problems when signing-up on internet sites?

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Do you have any problems when signing-up to some sites, like you get some errors or you just can't do something right, so it takes you half an hour just to register? And even then, can you use some non user-friendly sites after you register? Do you find your way out on internet? I do most of the time, although even I've had some problems a few times. How about you? Which sites bother you the most?