Emailed Author: Hi, all the media called in your plugin's css file needs to be included locally
https://www.facebookbrand.com/img/assets/asset.f.logo.lg.png
https://abs.twimg.com/a/1367451715/images/resources/twitter-bird-white-on-blue.png
And so on. Or you need to call them via the accepted calls by the services. What you're doing is hotlinking and it's not permitted.
Please send a link so the completed plugin can be downloaded. Alternately you can reply to this and send a .zip or .rar file. As this is for a new plugin request, please reply within seven days of this email or we will reject your plugin.