well.. a lot have posted security issues with the fact that they store ALL of your info on a server and that it can be easiliy compramised and your information stolen.. all of your accounts and passwords are stored locally and that can pose some major issues.. its not that it will happen, it is that it "could" happen.. others had posted some other things. .but that was mainly the one I could remember.. just mainly saying be careful.. and would highly recommend that you dont use the same passwords for those chat logins as your other secure ones like for banking etc..