User blog comment:Sannse/You and Your Socks/@comment-33878615-20160508213101/@comment-33878615-20160510205711

It’s not proper grammar.

“Used to do some work around Wikia every now and then” is not a complete clause. It does not have a subject.

If it said “she used to do some work around Wikia every now and then,” then it’d be a complete clause (it has a subject: “she”), so it’d be correct, but there’s no subject, so a comma isn’t necessary.