Yes, I started with blank project, and only used nuget to add Tweetinvi, which also added the dependencies automatically. I'm using no other manually added references.
nuget Tweetinvi dependencies list Unity as >= 2.1.505.2, whereas after auto updates, I now have Unity 3.0.1304.1
nuget Tweetinvi dependencies list Unity as >= 2.1.505.2, whereas after auto updates, I now have Unity 3.0.1304.1