The independent agency posted its response on Facebook and is encouraging staff to leave work an hour early to "do some good".
The post said: "Well. What a day. In a world where kindness and tolerance feel slightly lacking at the moment, we're going to try to do a little bit to redress the balance.
It recommends donating money to a charity, giving food to a food bank or calling parents and grandparents.
The post added: "It's not a lot, but we're feeling as helpless as the rest of you at the moment, and we want to be able to look back on today as a day when we did our bit to make a pretty battered world feel a little kinder. We want to leave today better than we found it.
"Why not join us? 4.30 today – shut your doors, close your laptop, and take an hour to do some good. The world might thank you for it.