So pretty much I've gotten text messages from certain people via Facebook when it's their birthday reminding me about it. The exact text message reads "Celebrate with (person's name here) today. Reply to write on his/her timeline." However, this doesn't happen with all my Facebook friends when it's their birthday. In fact, it's only happened with a few people over the last several months. My question is what is causing this to happen? I would assume it's a setting that the person has setup on Facebook to remind their friends who have their accounts linked to their mobile devices of when it's their birthday, but I checked in Facebook settings and can't seem to find anything. Just for clarification: I'm not following the people that I have gotten these text messages from on Facebook, I have checked and confirmed that. I say this because there was someone who thought that was the reason this is happening when I was trying to figure this out by searching online before I posted this here.