I'm a bit disappointed by the low turnout of friends I have listed in-game. I had tons of people in my TIS-100 lists after adding some for that, and I'd have expected at least half or so of those to also play this game. But beyond the introductory levels I usually only find 0-2 friends on the list.
Also, the scores from previous patches need to be re-verified. Which I know a lot of people on my list haven't bothered with.
Yeah, I imagine a lot of people are in the same situation as me. I haven't touched the game since October, so my scores are likely "wiped". I remember reading patch notes that mentioned adding in a reverification tool to facilitate the process, I'll fire up the game in a bit and check it out.
edit: Yeah, it's in the options and takes like 5 seconds to run.