RCMP say the boy's aunt is undergoing surgery after suffering more than 100 bites to her body, a broken arm and a detached bicep.
The social network sent automated messages Thursday inviting some users to celebrate "46 years of friendship on Facebook" with one or more of their online friends.
Peel Regional Police say they took a man into custody after his plane landed at Toronto's Pearson International Airport early Thursday morning.
The agency posted the warning on Twitter Thursday and followed it up with another tweet linked to a report about 16 passengers and crew being injured on an Air Canada flight in 2011.
Charges have been laid against a 47-year-old California man arising out of an accident on a British Columbia highway that injured several passengers.
An early morning call from the neighbour on Dec. 29 alerted RCMP that two people were loading furniture into a van outside a home, but by the time officers arrived, the van was gone.