I am now on my third iPad and have never experienced this problem - when I use the Search facility in Facebook the typing appears in white. As this is on a white background, it it virtually impossible to see. I have done the usual searches for advice, but can find nothing, and I am hoping that some Gransnetter more technically minded than I am is able to help. Save for this, there are no other problems with the iPad, though I appreciate that this is more a Facebook issue,
Another welcoming into Soop's kitchen for those who care to share...