Can you explain what "throw in" means here ,thank you in advance : )
The context basically is that working at home has quite a few advantages,
such as saving time, having healthier snacks to eat and having your dog hugging (1)at your feet .
"(2)Throw in a little Facebook,Twitter, etc. We are on all the time!"
Q(1): Should there be a preposition 'at' and why?
Q(2): What does 'throw in' mean in that sentence?
Thanks for your help!