Microsoft is engaged in a number of social-search-related projects across the company, and is building out Bing's social-search capabilities. But I'm thinking that Tulalip is something much less ambitious than anything like a Google+ or Facebook.
Read Tweets from your timeline.
See who you follow and follow new people.
Update your profile.
Post Tweets for you.
That's the standard text that Twitter applications use to request user-authorization, making me think Tulalip is a Twitter app or at least an app that accesses Twitter to collect information. Another interesting tidbit from the Tulalip page shows that it is a Cloupapp.net application, which implies that Tulalip is hosted on Windows Azure.
I do not know what Tulalip -- which may end up being branded as Socl.com -- is. But here's my best guess.
Spindex was designed to proactively analyze the trends in users' social networks by aggregating inputs from Facebook, Twitter, RSS feeds and Bing search results allowing users to share that information easily with friends. The Bing connection might explain the search box that Search Engine Watch noted at the top of the Tulalip page.
Spindex is no longer listed on the "active projects" page for FUSE, but neither is it included on the past projects part of the page. As there's an increasing emphasis at Microsoft to move research projects from experimental to commercial, I wouldn't be surprised to see Spindex surface from its proof-of-concept phase and debut some time very soon.