So you get an error while working on your blog like the picture above, and you are scratching your head, trying to find the blame on a plugin that may cause this.
Don’t fret, get to your Jetpack plugin, if you have one installed, and turn off social sharing, like the above screen shot.
This issue has been brewing for months, and no fixes on WordPress core, as yet. Have tried 4.9.6 nightly, no luck.
Enjoy, all you DIY bloggers, WordPress is still by miles the best and easiest CMS system you can build on in days, not weeks!
As of 2 May 2018, Jetpack version 6.1, this is no longer an issue!
Thank you, Automattic!