My coworker added me on facebook. Is it okay for me to add him on instagram?

I've known him for like 2 years now, worked together superficially. Having more meetings with him nowadays. He lives/works in another city (2 hrs from where I live), working for the same company. He works together with one my friend, so we had a launch together, and get to talk for an hour. On the way back he told my friend that he didn't know i was that cool/nice and friended me on facebook tha day after. Is it okay for me to add him on instagram (after a week) , or is it too straight forward that I fancy him?
My coworker added me on facebook. Is it okay for me to add him on instagram?
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