In my opinion, it's definitely coming from the Barca side. UK Journos not really paying much attention to the links, passing them off in one liners in unrelated articles. Nothing really huge or standalone been done by anyone, and Chelsea seem transfixed on Fofana at the moment, going all out on him. Plus add in their need for a striker too... it's looking like it's Barca who are pushing for United to panic and pay his outstanding wages to get the deal done asap.
The fact that United are calm and content at the moment says that they're not really too worried about these links. If they were concerned, they'd either make a stronger push to sign him or walk away if his mind was truly made up.