I have seen bitcoin be using many times in the donation websites, also few users here use bitcoin for charity. For example, bitcoincharity.org aka donatemedia accepts bitcoin for donation, few members also wear signature here.
Bitcoin is spread everywhere and accepting donations on bitcoin is fantastic.
I think it is a good idea to give bitcoins in charity as this will bring bitcoin some good name as many people are under wromg impression that bitcoin is mostly used in illegal activities or in dark market.on a second thought what good would bitcoin do to any charity organisation if we donate them some?bitcoin orice is unstable.If I donate 1000$ worth of bitcoin today and btc price fall after my donation,The charity i donate btc to would suffer loss