Was the image grey in Lightroom before uploading to Facebook? Are you uploading directly from Lightroom to Facebook?
No it wasn’t grey, I have never used lightroom before so do i need set the colour space or something I am editing in lightroom, then sending it over to photoshop then saving it from photoshop, everything looks fin until i upload it online
"I have never used lightroom before"
Then it's time to get a L/R book After you understand the basics online tutorials are great
as for the question I will leave that for techos
L/r is a bit of a head full to understand and very different to bridge/PS but once understood it is a really great editing/filing tool so stick with it. I found it best to turn off all other programs and work only LR.
So help out with scot kelby's retirement fund and get his book
Are you working on a PC or MAC? Is you OS up to date? What version of LR are you using, is it a CC copy?
Are you returning to Lightroom before sending the image to Facebook? Are you sending the image to Facebook from Lightroom? From your description, it doesn't sound like it and if that is the case, then Lightroom has nothing to do with your issue (assuming the image is not greyscale when it enters Photoshop).