Based on the idea of the YouTube Comment Snob, this bookmarklet will filter Newsvine comments based on poor grammar, spelling, and punctuation use. This approach works quite well to identify comments that are just as idiotic in nature as they are in regards to the English language.
To install, drag this button to your bookmarks bar and click when you visit a new Newsvine page.
Old version: NVSpam
Please see the introductory article or the follow-up for more information.
{var comments=document.getElementsByClassName('commentbody');var stime=new Date();for(var i=0;i<comments.length;i++){var commentDOM=comments[i];if(commentDOM.className.match('compact'))continue;if(IGNORE_FRIENDS&&commentDOM.className.match('friend'))continue;var commentText=commentDOM.getElementsByClassName('commentSource');try{commentText=commentText[0];commentText=commentText.innerHTML;}catch(e){continue;}var spamMsg=textIsSpam(commentText);if(spamMsg!=null)markAsSpam(commentDOM,spamMsg);}var etime=new Date();var elapsed=etime-stime;var eseconds=elapsed/1000;try{document.getElementById(TEXTAREA_ID).onkeyup=function(){checkInput();};tinymce.EditorManager.getInstanceById(TEXTAREA_ID).onKeyUp.add(function(ed,e){checkInput();});}catch(e){}}function textIsSpam(commentText){try{commentText=commentText.replace(/<blockquote>.*?<\/blockquote>/gi,'').replace(/<.*?>|\&.*?;/gi,'');}catch(e){return null;}if(commentText.match(/^\s*$/i)){return null;}if(commentText.replace(/[^a-z]/gi,'').match(/[A-Z]{20}/)||!commentText.replace(/[^a-z]/gi,'').match(/[a-z]/))return'yelling';else if(!commentText.match(/[A-Z]/))return'all lowercase';else if(!commentText.match(/[\.\?!]/))return'no punctuation';else if(commentText.match(new RegExp('(!|\\?){'+TOO_MUCH_PUNCTUATION+'}')))return'excessive punctuation';else if(commentText.instancesOf(/,[a-z]| ,|\?[a-z]/gi)>2)return'lack of spacebar use';else{var mistakes=commentText.instancesOf(new RegExp('[^a-z]('+misspellings.join('|')+')[^a-z]','gi'));if(mistakes>ALLOWED_MISSPELLINGS)return mistakes+' simple misspellings';}return null;}function checkInput(){var textarea=document.getElementById('commentsText');var ifr=document.getElementById(TEXTAREA_ID+'_ifr');var spamMsg;if(ifr==null){spamMsg=textIsSpam(textarea.value);}else{var doc=ifr.contentWindow||ifr.contentDocument;if(doc.document)doc=doc.document;var mce=doc.getElementById('tinymce');spamMsg=textIsSpam(mce.innerHTML);}var errSpan=document.getElementById('nvspam_error_span');if(errSpan==null){errSpan=document.createElement('span');errSpan.id='nvspam_error_span';errSpan.style.position='absolute';errSpan.style.color='red';errSpan.style.fontSize='10px';var whereToPost=document.getElementsByClassName('postcommentbuttons');if(whereToPost[0]!=null)whereToPost[0].appendChild(errSpan);}errSpan.innerHTML=(spamMsg==null)?'':'Your comment will be marked as spam ('+spamMsg+')';}String.prototype.instancesOf=function(regex){var instancesOf=this.match(regex);if(!instancesOf)return 0;return instancesOf.length;};function markAsSpam(e,msg){if(e.className.match('commentbody')&&!e.className.match('compact')){e.className=e.className+' compact';var cid=e.id.substr(1,e.id.length);var authorDOM=e.getElementsByClassName('c_author');if(authorDOM==null)return;authorDOM=authorDOM[0];authorDOM=authorDOM.childNodes[0];var newcomment=authorDOM.getElementsByClassName('newcomment');if(newcomment!=null){for(var i=0;i<newcomment.length;i++)newcomment[i].parentNode.removeChild(newcomment[i]);}document.getElementById('commentText_'+cid).style.display='none';authorDOM.innerHTML=authorDOM.innerHTML+'<span class='+unescape('%22')+'collapseDiv'+unescape('%22')+'><a href='+unescape('%22')+'javascript:void(0);'+unescape('%22')+' onclick='+unescape('%22')+'collapseComment('+cid+');'+unescape('%22')+' class='+unescape('%22')+'noborder'+unescape('%22')+'><img src='+unescape('%22')+'http://www.newsvine.com/_vine/images/_/b_expandcomment.gif'+unescape('%22')+' width='+unescape('%22')+'9'+unescape('%22')+' height='+unescape('%22')+'9'+unescape('%22')+' alt='+unescape('%22')+'Expand Comment'+unescape('%22')+' title='+unescape('%22')+'Expand Comment'+unescape('%22')+' /> Comment marked as spam ('+msg+')</a></span>';}}document.getElementsByClassName=function(cl){var retnode=[];var myclass=new RegExp('\\b'+cl+'\\b');var elem=this.getElementsByTagName('*');for(var i=0;i<elem.length;i++){var classes=elem[i].className;if(myclass.test(classes))retnode.push(elem[i]);}return retnode;};nvcs();){kind=link}