Implementing Chat On Facebook Web App -

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Implementing Chat On Facebook Web App -

this not technical question - sorry in advance .

i have social web app on facebook , want give app's users ability chat between (exactly way facebook chat looks). see here options :

1 : regarding facebook chat api http://developers.facebook.com/docs/chat/ not clear me whether works user's facebook friends or have ability allow non friends chat (it of import since 99% of users aren't supposed facebook friends). read few times , seems service facebook user , facebook friends , maybe wrong ?

2 : if right , facebook chat api friends , easy , safe way implement simple chat between 2 users myself? (i not expecting millions of users on app it's not out of question app implement chat).

per send message non-friend facebook user?, cannot send chat messages via api between facebook users not connected.

facebook facebook-graph-api chat facebook-chat

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