I was looking through wordpress settings today and noticed that some of my sites have only one update service listed. Is it important to add a bunch of services to notify every time I post or does the default rpc.pingomatic.com get the job done? Thanks in advance!
You can add more ping sites but pingomatic by default pings most of those sites. If you are using some sitemap plugin then it would anyways be updated at google etc. quite quickly to get your post indexed. So, not needed but you dont lose anything too by adding them. I personally do not bother a lot about them nowadays but I used to do when I started out.