grammar - "The people with whom you are talking" vs. "The people you are talking with"

Is it grammatically correct to say

"One of the disadvantages of chatrooms is that you do not know the people with whom you are talking"?

I think it is better to say "the people you are talking with" but I do not know if the first option would be possible.

Answer

‘The people with whom you are talking’ is formal bordering on the pompous. Your alternative is more appropriate for most occasions, but speakers of British English, at least, would be more likely to say ‘. . . is that you don’t know who you’re talking to’.