The wall of crap is probably the biggest turn off for a number of people. Stack Overflow gets thousands of questions per day, and honestly, most of them are worthless. Or off topic.

I'm going to further break down this problem and address one type of question: the recommendation question. Despite being thoroughly off-topic, these questions continue to be asked to this day.

My opinion has been that these questions are very easy to identify. And I will back this up. With programming! I wrote a SEDE query. It does bar graphs! And it finds recommendation questions pretty well (note that I have bar #5 set up as an overflow; it's the questions in the first few bars that are good matches).

I have included some results below (these are not cherry-picked; they are the first results). These are all OPEN questions, and most of them should be closed as recommendation Q's from the information in the title alone (I'll admit it's not perfect):

Any open source java library which can parse an EDI file in both ANSI x12 and UN/EDIFACT standards? Handling and syncing own custom version of an open source library with SVN Is there a raycasting library in C++ that is simple and open source? Open source object recognition library for visual browsing interfaces Cannot open source file: '..\..\basic-tutorial-1.c': No such file or directory Free or Open Source WinForms UI scraping / automation library Open source Geoparsing tool for Java? Performance test tool for GPU drivers Open source Mali/UMP Open source concept mining tools? What alternatives are there to the pHash open source perceptual hash library? Is DLIB a good open source library for developing my own machine learning algorithms in C++? Open source C++ library for vector mathematics Building open source library (liblo) for iPhone Open source Objective C (or C/C++) library for audio to H.323? Open source tools for testing purpose in Mac OS X Is there some open source tools for create tile map(IOS with cocos2d)? Open source XMPP library with BOSH support I am looking for Open Source Analytics tool for Sitecore. Any idea? open source "Performance testing and Load Testing" tools for web application Efficiently generating time index of pre-transcribed speech using it's audio source and open source tools Is it kosher for me to use HTMLAgilityPack in my free open source C# library? debugging python setup.py for an open source library - bcfg2 Open source mobile automation tools for Blackberry and Windows In need of help with setting up the open source library JFreeChart what are the tools to parse/analyze IIS logs - ideally free/open source? Is there a Java open source library for managing a NISO/ANSI Z39.19 controlled vocabulary in XML or SKOS format? Open source requirements management tool Open source language/library/representation format that allows treating numeric formulas as objects? open source code for RSA implementation in C/C++ (Use library or write my own) open source library for calculating 4x4 transformation matrix open source GUI tool for hadoop? Open source javascript library rendering comments popup box over page elements Is there an open source .NET equivalent to the date.js library? Does an open source markup->HTML tool exist for Confluence wiki markup? Want the list of languages supported by each font.Is there any open source font library or database listing them? open source library to convert all popular formats (.doc,.docx,.xls,etc) to pdf or generate thumbnails of firstpage of documents in asp.net Open source tool for MS SQL to SQL data migration (different schemas) Is there an Open Source library of some sort that identifies data patterns in a table? Eclipse plugin or a Open source tool to reverse engineer java code for sequence diagram BER-TLV open source library for Objective-C open source libraries for facebook ,emails ,IM How can I invoke a script at server side using the GUI of the already available open source server monitoring tools like Nagios, Cacti e.t.c.? is there any open source library to convert doc file to p[df file in ios? Open Source .net C# library for Real Time transport Protocol open source svn client java library which can be used in commercial development Open source e-commerce solution for a tool catalog based around EAV Is there any open source java library to convert FIX messages to json format? open source language recognition library? Is there any open source library is available in android for resizing the image? Open source wrapper library for all major brokers for submitting orders and getting prices? Open source tool for zipped file content searching? Facebook open source project FBCTF not starting after installation? How would I include open source library in my iPhone application? Open source spell checking library for Java Is there an open source tool to distinguish speech from song? Desperately trying to build open source tools (octave) on a Mac 10.6 Snow Leopard (involves Xcode, gcc, fink) Open source ER diagramming tool for mysql Facebook API key for an open source CMS What's best Python open source library to draw chart? Which tools is Best to make Accessible site ? open source or commercial? Is there any open source project using graphviz c++ library?

I really need more close votes (I hear mods get infinite close votes ;) ). I have only included a very small subset of all the questions that are returned; there are THOUSANDS more.

Seriously, this query only focuses on one type of question; imagine what could be done if I were to write more queries...