I popped my Wikipedia cherry the other day.
I didn’t contribute much. It was in an entry about food. I changed the following sentence from:
It is in trend for corn syrup to be flavored with vanilla extract (citation needed).
There is now a trend for corn syrup to be flavored with vanilla extract (citation needed).
Two minutes later someone deleted the whole sentence, presumably because it wasn’t supported by a citation. So my contribution to the sum of human knowledge was there for – oh – gosh – 120 seconds!