If they are, of course they'll be delighted to receive a text from you. If they're not, of course they'll be like, "Ugh. This person is a desperado." Just listen to that inner voice.
What's that? The voice is like, "Sorry, I totally died during your slutty college years, RIP me"? Crap! OK. Well, below is a concise little flowchart that you may find useful.