Never. Never even watch their stories because they can see you do it.
And never F with a co-worker. So my following advice is general - not specific to your co-worker situation which you should not get into.
My social media does a good job of communicating my status so I'm fine with connecting with women I meet or date on social media, however, I will NEVER like their pics or watch their stories. This even applies to a girl I'm in an LTR with. It drives most of them nuts but I have found 9 out of 10 women seem to be obsessed with leveraging their social media as an attempt to assess many things about you, and they do this specifically by posting old "memory" pics of them with other men or current pics/stories of them with other men, with zero context of any kind. Is it their cousin? Date? Gay best friend? WHO KNOWS?! That's the point. You can't react. But then you also have to consider boundaries around her posting pics like that, when and if the relationship becomes serious. So I just won't watch stories. The girl I'm dating now has absolutely noticed I haven't watched a single story of hers and she hasn't said anything overtly about it, but is trying to "lure" me in by messaging me, "Oh I found the funniest thing and posted it on my story... you have to check it out!" LOL!!! I'm definitely going to "forget" about her ask.
Game women in person, directly. Not over social media. It can work on social media but you are competing with WAY more people than if you have the balls to do it F2F. Gaming on social media is also very beta and sheepish in situations where you see the woman in real life daily or from time to time and could approach her F2F. It communicates you are too much of a pvssy to talk to her F2F and have to do it behind a keyboard instead.