You have to meet someone first to be able to enjoy a loving relationship later. Many scammers have gotten around this by virtual meeting online and only when the two meet does one person find out they have been played very badly because you cannot tell by tweeting.
Body language is important as too is style, mannerisms, body shape, facial features and erectness (walking proud or tall vs the opposite). On a first date you get to see some of those and form a quick opinion which is either confirmed or changed by behaviour on future dates. All this makes up a person’s profile and you have to date to discover it.