Are you talking about talking to classmates in the course of the day at school or this "talking to guys" as people say now adays as in sort of dating "we have been talking for a few months now..." that teens consider dating or prospective dating or moving into that territory. if its the latter, i say anyone should talk to everyone, but if its that "do i want to go steady with you" "i have been talking to this guy for awhile" stuff - i think that no its not cool to be talking to 10 guys and making them all think you have something going on with them and are on the verge of publicly dating. Talk to one or two for a bit and if you don't want to date either, move on to someone else.