In this following link you will find an excellent Gartner report entitled “Magic Quadrant for Team Collaboration and Social Software”. This report introduce the challenges, the strengths and the cautions about several vendors (like BEA, IBM, Microsoft, SocialText, etc.).
http://64.45.25.194/clients/socialtext/quadrant/Socialtext_2513_GartnerM.pdf
Lino 2.0 