facebook background task host "backgroundTaskHost.exe"

one hour ago, I made wake up my computer from sleep, suddenly I saw the ms-dos screen for a second. There was only one line text. Then immediately I opened the task manager. I saw the "facebook background task host" with the original facebook icon. Next, I opened the folder that includes the file. It turned out the original name of the file is "backgroundTaskHost.exe"
it is a 10 kb file. under the system32 folder. and file information says it is a microsoft corp. file.
I don't get it, what is relation btw those two corporation. Am I under attack or something like that? Thanks.
OS: Win 8.1

Do you have a Facebook app installed on your computer? I heard that the backgroundtaskhost.exe crashes when there is a Facebook App installed on the computer.

Can you provide a copy of your System Information so that we can check further what it is about? To export your System Information, go here: checking msinfo32.