Može, samo to trebaju admini dodati

vbulletin forum:
You can easily allow your users to add their Googletalk/Gmail address to their profile by adding a custom profile field in the Admin CP.
Ali, ako sam dobro shvatio, ne može se integrirati kao ovi ostali
Yahoo, MSN, ICQ, AIM and Skype all have a Web Development API to integrate your web application with the various communication tools they provide. Google has provided no such API and therefore there is nothing to integrate.