Is he really into me?

Sooooo... I've had this work crush for a while. We don't work in the same department, but we kind of interract throughout the day. All of my friends encouraged me to follow him on socials, but I think this is kind of desperate since we don't have any mutuals. So this part is where it gets confusing. Since this week I've had no sign that he's even remotely into me. But lately, a work friend of mine said that the other day, when he stopped by our department, he couldn't take his eyes off of me. I seriously didn't catch that because I was busy. And then again she said that the other time he stopped by, he fixed his hair. You know, like fixing your hair to look nice for someone?!?! Again, didn't notice cause I was busy. I told her to stop feeding my delulu and she encouraged me as well to follow him on socials, despite not us having any mutuals. So I have a few questions. First, should I follow him or does it seem too desperate, like I stalked him or something. And second, does he seem like he likes me? I don't know, I kind of feel like "when you know, you know". I have no clue. What do you guys think?