When we're interested in someone, we check Certs, and usually check out those profiles. We haven't contacted them, and don't see a problem with it. But it should be done tastefully. Questions like "Were they punctual?" "Were they polite? " "Were they dressed appropriately for the meeting?" would be acceptable. It lets us know they are real grownups.
But if you advertise who you've met with, regardless of playing (some certs clearly state there was or wasn't, but some are a bit vague and that's fine) you open yourselves to some conversations.
One of our certs was from a LS group where we've been to a few parties and didn't play but it's obvious there are others we HAVE had some kind of play time with.
I would NOT consider it proper to ask how someone was in bed or other intimate details that are opinion or other personal info that really isn't my place to provide.