Online, sure.
Although I guess "friends" might be stretching it. I don't really talk to them much.
I guess maybe aquaintances might work better.
I also know some bisexual dudes, if that counts. Also online.
Offline, I know of a gay guy. I used to know him in primary school. I found out years later by hearsay.
In hindsight, it seems pretty obvious.
That's about the extent of it.
By the way, OP, I feel I should point out that the only difference between straight people and gay people is what gender they are into.
Don't make a big fucking deal about it. Judge the kid on his own merits.