Can you use facetime on a PC

No.

Be careful! There are several websites that say you can download facetime for pc or Windows. I opened one of them, and my computer got infected with some serious malware. I tried everything to remove it, but it just came right back. I had to do reset my computer without saving my files, because the malware prevented me from doing that. Luckily I had all my files saved on icloud or similar cloud-based software.