Performance of Facebook promotions

Regarding the promoted post - xx
Here are the top 10 duplicate shares on the post:

Lucious White - 28 shares
Ako Nai - 17 shares
Stephen Schreiber - 17 shares
Nathan Musikchild Ray - 9 shares
Farakhan Norris - 6 shares
Beau Forester - 5 shares
Dennis Vinci - 5 shares
Bob Holden - 4 shares
James Thomas Downey - 4 shares
T Donebullshidden Knight - 4 shares

These accounts have been observed sharing and liking other promoted posts too.

The total list of displayed shares is only 382, even though the displayed count is 1363.
Understandably, this is due to private shares.

But only 244 of the shares are by unique people.

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As you can see, the high bounce rates are only for Facebook clicks.
The bounce rates for users from Google, Bing, Yahoo etc are much lower.

In any case, my concern is not the high bounce rate in itself.
That could be content and context specific.

My real concern is the large number of confirmed duplicate shares by
certain users. These duplicate shares have me worried about the authenticity of the
likes and clicks as well.