Definitely getting those bugged messages with the beta. I suddenly got a notification from someone saying "Hey," but when I checked, they hadn't said anything to me and probably wouldn't have. Then I realized that looked similar to something I'd send, so... that's a strange, annoying bug. But yes, it is the Beta, so that's to be expected.
Although I'm still getting this loving problem where Steam starts telling me to close stuff before validating when I'm not even touching anything. It mounts up these messages like 10 times over sometimes for no apparent reason. Forcing it to redownload the .blob files temporarily fixes it, but why does it always have to break?