Электропочта is a very informal, slang word. I can't immagine it in some contact form.email could be
Ф.И.О. means complete name, i.e. the name, the patronymic and the surname. It rather has to do with some official form, but not just contact form on the Internet.name could be "Ф.И.О" or "Имя" or "Представьтесь"
Why is it a slang word? I agree that it doesn't sound so official as "электронная почта".Электропочта is a very informal, slang word. I can't immagine it in some contact form.
Really? But there are lot of this kind of forms in the Runet . Usually they are used in forms on corporate sites (banks's, official company's sites, ecommerce). But they are still contact forms.
You right, it's usually used as a validation response. But for a blog or a entertainment site, I think, it's ok and would be not bad."Представьтесь" means that you offer to a person who fills the form in, to write his name here. But most likely it's a field for the name of the addressee (then Кому is perfect). Anyway Представьтесь sounds veeeeeery formal.
Anyway, we should get more context ( what's it a kind of site?) for this words to get the most appropriate suggestion.
I think,it should be spelled like listed below until we dont' know a context.
Because it is.Why is it a slang word?
"Электронная почта" sounds neutral.I agree that it doesn't sound so official as "электронная почта".
Cause of the Lebedev's suggestion?Because it is.
I don't know "why", I know it's just so.
Sure as we are talking about a Russian contact form. But who this form for? I guess for Russians."Ф.И.О." is ok only for Russians (and even not always and not everywhere) because only Russians have patronymics.
When I for the first time in my life encountered ФИО I had at first no idea at all what it means exactly even though I knew it had to mean 'name'.
If it is a contact form to contact a webmaster by his website, ФИО would not be ok in this case. I'd be surprised if a webmaster would ask my ФИО just for answer to my message. It would be strange. For contact to a webmaster, ФИО isn't needed at all. It's enough to give a nickname. For example, Ptak or something.So I guess if the contact form is meant for Russians which seems to be the case ФИО would be perfectly okay.