how to post a link on facebook use sdk PHP - php

Question

i'm creating function to share a post to facebook and i'm following docs : https://developers.facebook.com/docs/php/howto/postwithgraphapi. but it's not work.
This is my function
public function shareFB(Request $request, $slugify)
{
$petition = Petitions::where('slug', $slugify)->first();
$access_token = auth()->user()->social_account->access_token;
$fb = new Facebook\Facebook([
'app_id' => config("services.facebook.client_id"),
'app_secret' => config("services.facebook.client_secret"),
'default_graph_version' => 'v2.2',
]);
$linkData = [
'link' => route('petitions.index',$petition->slug),
'message' => $request->get('shareFB'),
];
try {
$response = $fb->post('/me/feed','post', $linkData, $access_token);
} catch(Facebook\Exceptions\FacebookResponseException $e) {
echo 'Graph returned an error: ' . $e->getMessage();
exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
$share = $response->getGraphNode();
}
and here is my route in laravel
Route::post('share/p/{slugify}','Frontend\SocialController#shareFB')->name('social.shareFB');
When i clicked a button have href above, it's show MethodNotAllowedHttpException . somebody help me solve that!!!