Mafia lies spread by those accommodating types on some sites (7)
I believe the answer is:
mobiles
'those accommodating types on some sites' is the definition.
I can't tell whether this definition defines the answer.
'mafia lies spread by' is the wordplay.
'mafia' becomes 'mob' (I can't explain this - if you can you should give a lot more credence to this answer).
'spread' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'lies' anagrammed gives 'iles'.
'mob'+'iles'='MOBILES'
Can you help me to learn more?
(Other definitions for mobiles that I've seen before include "decorations" , "American's cells" .)