So far, I haven't recognized anyone from 4chan, but as someone who posted on lolcow for years and created a few threads there, I sometimes read threads and posts here (usually ones that specifically mention lolcow) and think I recognize some lesser-discussed cows who are the topic of /snow/ and /w/ threads. These cows are ones that have either openly said they browse/post on imageboards, have been caught doing so after denying it, or have been caught selfposting in their threads, so it's not unlikely.
I was actually compelled to make this post after reading a post made a few hours ago in a different thread that seems like someone who's been discussed in a lolcow thread that I created.Like
>>52180, I tend to recognize posters on slower imageboards (such as this one) due to their typing style, especially posters who speak English as a second language and make the exact same spelling and grammar errors across the site.