This is why I started this site.  I couldn’t keep track of all of the new Social Media platforms, apps, tools, etc. This graphic shows a couple hundred apps divided into:

Social Marketing Management
URL Shorteners
Stream Platforms
Twitter Apps
Facebook Apps
Facebook Gaming
Analytics
Content Curation
Social Advertising Platforms
Social AD Networks
Social Intelligence
Social Business Software
Social Brand Engagement
Social Scoring
Social Commerce Platforms
Social Data
Social TV
Social/Mobile Apps & Games
Social Search & Browsing
Social Networks (Other than Facebook)
Social Shopping
Content Sharing
Blogging Platforms
Community Platforms
Social Referral
Photo Sharing
Plug-ins/Widgets
Traditional Publishers

Social media marketing landscape complicated – Business Insider.