Facebook timestamp on Ipad?

Hey guys! I have a question about the Facebook timestamp while on Ipad. When using the Facebook browser on an Ipad, what does the timestamp next to someones name mean? I went to go to message my boyfriend and the timestamp says 2 hours ago. He doesn't use the new messenger to send messages, he does it through the Facebook browser (showing Facebook "F" icon) on his Ipad. Does the timestamp show when he was browsing Facebook or when they messaged someone last? Thank you all for your help!
+1 y
This isn't the downloaded messenger app i'm referring too either, its when you message using your Facebook browser on a desktop or Ipad
Facebook timestamp on Ipad?
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