A popup stopper, or Adaware or Spybot Search and Destroy, will probably get rid of them, if they don't say "Messenger Service" on top of them. If they do say "Messenger Service" then get rid of them using this method. click here
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?