I was able to resolve it last night by going into ftp and changing my plugin folder name. After everything was deactivated I turned everything back on and it all worked great. I am wondering: it looks like Pinterest is now social set. When I used it before I added Pinterest as per the instructions. Perhaps that is what did it because the error was about Pinterest and the update "dislodged" it. I do have a Pinterest feed for the side bar and come to think of it - did not turn that back on last night so that could be the culprit as well: a conflict between the two.
Thank you for your response and offer to help! Best, Georgia