Nowadays almost everyone who is willing to marry have an account in atleast one matrimonial site like Jeevansaathi.com , Shaadi.com and many more. This is because they give you a platform to meet.
Generally the accounts are original exept some. But to be on the safer side we should try to search about the guy and get the opinions about him.
This is because they may be fraud and may kidnap you asking for a place to meet. Nowadays it is better to opt for a paid membership as it will be better, fast and easy to use.
But atlast I would say that don’t trust these sites blindly as there are some cases heard in the newspapers about kidnapping and asking for ransom money.