know somebody by sight

I got to know you pretty well, and not just by sight.

I'd know some of them by sight, but not all.

She knew many of the people there by sight; others were new to her.

It often was not necessary, as I knew half of them by sight.

He said that the people of the area knew everyone by sight.

We had known each other by sight for some few days past.

All of them were boys I knew only by sight.

He knew us all by sight and never had done such a thing before.

Only a few people in the town knew him by sight.

How many people would know him and the rest by sight?