Purple Mystery

Thank you for all the responses last week helping to identify my mystery plant. So I'm going to ask your help again to identify this one.  I thought it might be a nightshade.  It's  a  pretty creeper but with small children around I want to be sure it is not dangerous. Although these flowers appear blue they are more of a lilac colour in reality.



See how each little flower pokes out a tiny "tongue" from the yellow centre piece.

This little single blossom fell from the bunch above and came to rest on the irregular leaf below.  Its no bigger than my thumb nail but so delicate and pretty. 

Is it friend or foe?

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