Someone is sending FB messages that appear to come from my android! HOW? We recently had a house guest who asked to use my phone. She is sending Facebook messages drom her Android phone that appear to be coming from me! This is causing serious problems! I want to catch her. I suspect she has also stolen items that could be used for identity theft. My device is an unlocked LG. I don't have a carrier, I just use our Wi-Fi. Her phone is also an LG through Boost Mobile. Any information would be greatly appreciated.

Thank you
Just do a system format she might have installed things onto your
  phone, make sure to back up things you need. reset your phone by:
  1. powering it down.
   2. Hold the power button + Home button + Volume down button (Together and hold until you see  light).
   3. Use the volume keys to move up and down and the power button to select options.
   4. Locate wipe data/factory reset (use volume keys to go to it and use power button to select it).
   5. you will see a confirmation to confirm the factory reset use the volume keys to go to yes and press the power button to select it.
   6. wait for it to complete then select reboot system now.
   7. done.
   8.  (also change your facebook password just to be safe).