Can someone go on Facebook on an iPhone if their home button is broken?

I'm trying to figure out if someone is lying to me or not. We were cool as of two days ago then the yesterday I text them and they don't text back so I ask hello and no reply so I text again and say that I hope there was no misunderstanding about what I texted them with and no reply so I shoot them one more text and ask them if we're still cool or if not than just let me know and I'll leave them alone and then they finally text back to that and say that everything is ok and that their home button is broken and they have to get a new phone but then I see today that they were on Facebook at 2 in the morning. How are they on Facebook if their home button is broken?