I sometimes come across these funny faces in some user's stats but couldnt find any info about what they represent

The person with the most hotlaps uploaded is on position 1 in the nutter rank. So its a list with the drivers, who uploaded most hotlaps.

Thanks, that was fast

You do know this page : http://www.lfsworld.net/

Log in with your username and password.

The nutters ranking is all the combinations of cars/tracks available in lfs. As long as they are legal, they`ll count here. You`ll see some guys have red times and some guys have green ones. To get a green time, you`ll have to drive a hotlap faster than the WR on that track/car combo + 3%

If you cannot do that and you upload your hotlap, your time will turn red.
You can have red and green times together, but they`ll add them together, and the resulting time will then be green, if you have fast laps enough or red if not.

Then there is the MHR ranks. This is the ranking for the pro guys !
(That`s why I`m not there )
That is 18 cars and 18 tracks, someone has chosen, to find the best allrounder in the Lfs community. This ranking is much, much harder than the nutter ranking.

Then you can drive - Lets say uf1000 on 18 tracks, the normal way around the track. There is a little ranking for every car in the Lfs, but the two new tracks aren`t present yet. These are popular rankings.