Answer
The procedure of marriage via the internet is same as marriage by proxy
where one of the partners (boy or girl) propose to marry the other. The
proposal be written in the presence of two witnesses.
The two witnesses should also sign the document be sent to the other party,
for example, in a foreign land and accept the written proposal in the
presence of two witnesses. It is important to exercise extreme precaution by
verifying the proposal and its witnessing to avoid any possibility of fraud
and deception.
And Allah Ta’ala Knows Best
Mufti Ebrahim Desai