If the person who delivered the papers is a process server he doesn't sign them. If papers are genuine court papers it will tell you what to do next. You should have someone look at the papers to ascertain whether or not they are legitimate court papers, or alternatively call/visit the court that is mentioned in the papers and ask them what you should be doing. They will not give legal advice but should explain the court processes to you.
He didn't say who he was - does he have to?
The papers are identical to those I found on the internet - they state...
"You are commanded that,within 10 after the service of this Writ on you,exclusive of the day of such service, you can cause an appearance to be entered for you in the District Court in an action at the suit of the above named Plaintiff; and take notice that in your default of your so doing the Plaintiff may proceed therein and judgement may be given in your absence." Does that mean I'll be given a court date within 10 days of this letter?
Do you recommend me contacting the lawyer and offering an apology on the Facebook page?
Also are the 28 days working days, or calender days. Working days I still have time, calendar days I do not. However the date of the Writ is WITHIN the 28 days either day.