Admittedly am very bad with names but not totally sure I know the two people who have popped up (have only been signed up for a fortnight) - can you accept and then look at their profile to check you know them and can you delete them later ? Or can you just ignore the request and hope you haven't offended anyone you shouldn't have ?
Wish there was a 'um thanks for this but can you remind me where I might have met you ?' response