I mean I personally tend to save my RT image full, then open the JPG file in RT apply sharpening, sometimes using the tone mapper, and yes I agree, definitely, don’t be gentle with it because it has to stand out against Facebook’s compression massacre that is to follow, then save it as 1200px wide side 90% or 100% compression and Best quality and then upload that. The 90% vs 100% depends on whether I feel like waiting slightly longer for the upload or not 
Definitely 90% or even 80% for blog upload (same size - 1200px wide side) because the quality is pretty good when no further web site based compression is applied.