Is it okay to ask "Do we know each other" if someone random follows you on Instagram?

[Anonymous]

What if you get the feeling like you might know who that person is (but just aren't sure)? Is it okay to ask that question (especially if they didn't send you a text)?

Updates

+1 y

What if you think you know who that person is but just want confirmation?

[AssholeNumberOne]

Of course it is. Appropriate question for the situation