I am using facebook version 4.14 in my app inorder to share Hashtag along with Imageurl and Contenturl using ShareLinkConent. Now Hashtag is successfully posted inFacbook .
ShareLinkContent linkContent = new ShareLinkContent.Builder()
.setShareHashtag(shareHashTag)
.setContentDescription(textd)
.setContentUrl(Uri.parse(influencer.influencer_link))
.setImageUrl(Uri.parse(selectedIceCreamImagePath)) //Uri.parse("https://d3kvf6cfq06287.cloudfront.net/influencer/image2_1469508676.jpg"))
.build();
shareDialog.show(linkContent, ShareDialog.Mode.FEED);
We need to open the ShareDialog with the Mode.FEED option.. Then our image will be posted correctly in FaceBook Feed