No nos hemos visto desde el miércoles. Supposedly this is " We have not seen/met each other since Wednesday." There seem to be quite a few possible translations for "each other", none of which are in this sentence. To me it seems to say "We have not seen since Wednesday." without specifying who or what we have not seen. What do I not see?
What wataya said. Technically is could also mean we haven't seen ourselves, but haven't seen each other is a more natural interpretation.