I was going to research the exchanges and make an informative compiliation but it looks like BitcoinMagazine has beat me to it, luckily! haha. If your exchanges are these:
Bitfinex, Bitmex (awesome stance on s2x), Bitstamp, GDAX (Coinbase), Bitflyer, Kraken, HitBTC, Bitcoin.de, CoinsBank, Cex.io, itBit, Gemini (Winklevoss’ exchange), Coinfloor, BTCC (Chinese), BitMarket, QuadrigaCX (Canada), Mercado Bitcoin (Brazil & Argentina), Bitso, The Rock Trading, & EXMO … then check the detailed descriptioins of those on BTCmag here.
But also make sure to check your exchanges own blog or announcements pages so you can hear it from the horse’s own mouth.